In philately, a mixed franking is an occurrence of postage stamps of more than one country or issuing entity on a single cover — or the occurrence of postage stamps of more than one currency of a country or issuing identity on a single cover. Since nearly all countries of the world have agreed to deliver each other's mail, it is unusual to need more than the stamps of the originating country; valid mixed frankings are uncommon and valued by collectors.
Before the advent of the Universal Postal Union in 1874, sending international mail was quite an adventure; it might be necessary to affix the stamps of the destination country in addition to those of the origin, and in the worst cases, possibly for several other countries along the way. Sometimes the letter was held until the recipient brought stamps, they were affixed and cancelled, and the result handed to the recipient. Since this only happened during the first few decades of stamp usage, and only for the few letters that were sent great distances, very few covers have survived. For some combinations, only single examples have survived, and command spectacular prices among collectors.
Another form of mixed franking occurs in transitional periods, either as a way to help the public use up the stamps of a defunct government, or involuntarily as a propaganda tool.
An example of involuntary mixed franking is when Germany took over Austria in the Anschluss in 1938; during the several months while Austrian stamps were still accepted, Austrians sending mail to Germany were required to include a German stamp on the envelope.
Sometimes illegitimate mixed frankings occur when a postal user adds another country's stamps to an envelope just for fun. Many countries' postal regulation require clerks to refuse to handle these, even if the correct postage of the country is present, because they slow down the sorting process, but such covers can still get through the system.
Friday, December 30, 2011
Tuesday, December 27, 2011
Predynastic period
The Nile Valley of Egypt was basically uninhabitable until the work of clearing and irrigating the land along the banks of the river was started.[1] However it appears that this clearance and irrigation was largely under way by about 6000 BC. By that time, society in the Nile Valley was already engaged in organized agriculture and the construction of large buildings in the Nile Valley.[2] At this time, Egyptians in the southwestern corner of Egypt were herding cattle and also constructing large buildings. Mortar was in use by 4000 BC. The people of the Nile Valley and on delta were self-sufficient and were raising barley and emmer (an early variety of wheat) and stored it in pits lined with reed mats.[3] They raised cattle, goats and pigs and they wove linens and baskets.[4] The Predynastic Period continues through this time, variously held to begin with the Naqada culture.
Between 5500 and 3100 BC, during Egypt's Predynastic Period, small settlements flourished along the Nile, whose delta empties into the Mediterranean Sea. By 3300 BC, just before the first Egyptian dynasty, Egypt was divided into two kingdoms, known as Upper Egypt, Ta Shemau, to the south, and Lower Egypt, Ta Mehu, to the north.[5] The dividing line was drawn roughly in the area of modern Cairo.
The Tasian culture was the next to appear in Upper Egypt. This group is named for the burials found at Der Tasa, a site on the east bank of the Nile between Asyut and Akhmim. The Tasian culture group is notable for producing the earliest blacktop-ware, a type of red and brown pottery which has been painted black on its top and interior.[6]
The Badarian Culture, named for the Badari site near Der Tasa, followed the Tasian culture, however similarities between the two have led many to avoid differentiating between them at all. The Badarian Culture continued to produce the kind of pottery called Blacktop-ware (although its quality was much improved over previous specimens), and was assigned the Sequence Dating numbers between 21 and 29.[7] The significant difference, however, between the Tasian and Badarian culture groups which prevents scholars from completely merging the two together is that Badarian sites use copper in addition to stone, and thus are chalcolithic settlements, while the Tasian sites are still Neolithic, and are considered technically part of the Stone Age.[7]
The Amratian culture is named after the site of el-Amra, about 120 km south of Badari. El-Amra was the first site where this culture group was found unmingled with the later Gerzean culture group; however, this period is better attested at the Naqada site, thus it is also referred to as the Naqada I culture.[8] Black-topped ware continued to be produced, but white cross-line ware, a type of pottery which was decorated with close parallel white lines crossed by another set of close parallel white lines, began to be produced during this time. The Amratian period falls between S.D. 30 and 39 in Petrie's Sequence Dating system.[9] Trade between Upper and Lower Egypt was attested at this time, as newly excavated objects indicate. A stone vase from the north was found at el-Amra, and copper, which is not present in Egypt, was apparently imported from the Sinai, or perhaps from Nubia. Obsidian[10] and an extremely small amount of gold[9] were both definitively imported from Nubia during this time. Trade with the oases was also likely.
Between 5500 and 3100 BC, during Egypt's Predynastic Period, small settlements flourished along the Nile, whose delta empties into the Mediterranean Sea. By 3300 BC, just before the first Egyptian dynasty, Egypt was divided into two kingdoms, known as Upper Egypt, Ta Shemau, to the south, and Lower Egypt, Ta Mehu, to the north.[5] The dividing line was drawn roughly in the area of modern Cairo.
The Tasian culture was the next to appear in Upper Egypt. This group is named for the burials found at Der Tasa, a site on the east bank of the Nile between Asyut and Akhmim. The Tasian culture group is notable for producing the earliest blacktop-ware, a type of red and brown pottery which has been painted black on its top and interior.[6]
The Badarian Culture, named for the Badari site near Der Tasa, followed the Tasian culture, however similarities between the two have led many to avoid differentiating between them at all. The Badarian Culture continued to produce the kind of pottery called Blacktop-ware (although its quality was much improved over previous specimens), and was assigned the Sequence Dating numbers between 21 and 29.[7] The significant difference, however, between the Tasian and Badarian culture groups which prevents scholars from completely merging the two together is that Badarian sites use copper in addition to stone, and thus are chalcolithic settlements, while the Tasian sites are still Neolithic, and are considered technically part of the Stone Age.[7]
The Amratian culture is named after the site of el-Amra, about 120 km south of Badari. El-Amra was the first site where this culture group was found unmingled with the later Gerzean culture group; however, this period is better attested at the Naqada site, thus it is also referred to as the Naqada I culture.[8] Black-topped ware continued to be produced, but white cross-line ware, a type of pottery which was decorated with close parallel white lines crossed by another set of close parallel white lines, began to be produced during this time. The Amratian period falls between S.D. 30 and 39 in Petrie's Sequence Dating system.[9] Trade between Upper and Lower Egypt was attested at this time, as newly excavated objects indicate. A stone vase from the north was found at el-Amra, and copper, which is not present in Egypt, was apparently imported from the Sinai, or perhaps from Nubia. Obsidian[10] and an extremely small amount of gold[9] were both definitively imported from Nubia during this time. Trade with the oases was also likely.
Sunday, December 25, 2011
Week News Abstract For SFP Series in 10GTEK: Northern England
James II & VII (14 October 1633 – 16 September 1701)[2] was King of England and King of Ireland as James II and King of Scotland as James VII,[1] from 6 February 1685. He was the last Catholic monarch to reign over the Kingdoms of England, Scotland, and Ireland. Members of Britain's political and religious elite increasingly opposed him for being pro-French and pro-Catholic, and for his designs on becoming an absolute monarch. When he produced a Catholic heir, the tension exploded, and leading nobles called on William III of Orange (his son-in-law and nephew) to land an invasion army from the Netherlands, which he did. James fled England (and thus was held to have abdicated) in the Glorious Revolution of 1688.[3] He was replaced by William of Orange who became king as William III, ruling jointly with his wife (James's daughter) Mary II. Thus William and Mary, both Protestants, became joint rulers in 1689. James made one serious attempt to recover his crowns, when he landed in Ireland in 1689 but, after the defeat of the Jacobite forces by the Williamite forces at the Battle of the Boyne in the summer of 1690, James returned to France. He lived out the rest of his life as a pretender at a court sponsored by his cousin and ally, King Louis XIV.
Cumberland, Westmorland, Lancashire, County Durham and Northumberland were established as counties in the 12th century. Lancashire can be firmly dated to 1182.[34] Part of the domain of the Bishops of Durham, Hexhamshire was split off and was considered an independent county until 1572, when it became part of Northumberland.
Cumberland, Westmorland, Lancashire, County Durham and Northumberland were established as counties in the 12th century. Lancashire can be firmly dated to 1182.[34] Part of the domain of the Bishops of Durham, Hexhamshire was split off and was considered an independent county until 1572, when it became part of Northumberland.
Thursday, December 22, 2011
Paleocene–Eocene Thermal Maximum
The most extreme change in Earth surface conditions during the Cenozoic Era began at the temporal boundary between the Paleocene and Eocene epochs 55.8 million years ago. This event, the Paleocene–Eocene Thermal Maximum (PETM, alternatively "Eocene thermal maximum 1" (ETM1), and formerly known as the "Initial Eocene" or "Late Paleocene Thermal Maximum",[1] (IETM/LPTM)), was associated with rapid (in geological terms) global warming, profound changes in ecosystems, and major perturbations in the carbon cycle.
Global temperatures rose by about 6 °C (11 °F) over a period of approximately 20,000 years. Many benthic foraminifera and terrestrial mammals went extinct, but numerous modern mammalian orders emerged. The event is linked to a prominent negative excursion in carbon stable isotope (δ13C) records from across the globe, and dissolution of carbonate deposited on all ocean basins. The latter observations strongly suggest that a massive input of 13C-depleted carbon entered the hydrosphere or atmosphere at the start of the PETM. Recently, geoscientists have begun to investigate the PETM in order to better understand the fate and transport of increasing greenhouse-gas emissions over millennial time scales.
Global temperatures rose by about 6 °C (11 °F) over a period of approximately 20,000 years. Many benthic foraminifera and terrestrial mammals went extinct, but numerous modern mammalian orders emerged. The event is linked to a prominent negative excursion in carbon stable isotope (δ13C) records from across the globe, and dissolution of carbonate deposited on all ocean basins. The latter observations strongly suggest that a massive input of 13C-depleted carbon entered the hydrosphere or atmosphere at the start of the PETM. Recently, geoscientists have begun to investigate the PETM in order to better understand the fate and transport of increasing greenhouse-gas emissions over millennial time scales.
Tuesday, December 20, 2011
Archaeology
The archaeological evidence of the largely indigenous origins of Israel is "overwhelming," and leaves "no room for an Exodus from Egypt or a 40-year pilgrimage through the Sinai wilderness."[21] For this reason, most archaeologists have abandoned the archaeological investigation of Moses and the Exodus as "a fruitless pursuit."[21] A century of research by archaeologists and Egyptologists has found no evidence which can be directly related to the Exodus narrative of an Egyptian captivity and the escape and travels through the wilderness,[18] and it has become increasingly clear that Iron Age Israel - the kingdoms of Judah and Israel - has its origins in Canaan, not Egypt:[22][23] the culture of the earliest Israelite settlements is Canaanite, their cult-objects are those of the Canaanite god El, the pottery remains in the local Canaanite tradition, and the alphabet used is early Canaanite. Almost the sole marker distinguishing the "Israelite" villages from Canaanite sites is an absence of pig bones, although whether this can be taken as an ethnic marker or is due to other factors remains a matter of dispute.
Sunday, December 18, 2011
Week News Abstract For SFP Series in 10GTEK:Bretwalda
Bretwalda (also brytenwalda and bretenanwealda) is an Old English word, the first record of which comes from the late 9th century Anglo-Saxon Chronicle. It is given to some of the rulers of Anglo-Saxon kingdoms from the 5th century onwards who had achieved overlordship of some or all of the other Anglo-Saxon kingdoms. It is unclear whether the word dates back to the 5th century and was used by the kings themselves, or whether it is a later, 9th-century, invention. The term bretwalda also appears in a charter of ?thelstan.
The rulers of Mercia were generally the most powerful of the Anglo-Saxon kings from the mid-7th to the early 9th centuries, but are not accorded the title of bretwalda by the Chronicle, which is generally thought to be because of the anti-Mercian bias of the Chroniclers. The Annals of Wales continued to recognize the kings of Northumbria as 'Kings of the Saxons' (i.e. the English) until the death of Osred I of Northumbria in 716.
Bretw?lde was a term used in 11th and 12th century Ireland to denote the 'high king'. Part of the Gaelic lexicon, this spelling suggests a Germanic (Saxon) origin, as the 'w' is most likely pronounced as a 'v'. It is also possible that the term derives from the Welsh Brit Gweldig, the term for a ruler of Britain.Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, where the production of nickel-56 (which decays to iron) is the last nuclear fusion reaction that is exothermic. This allows radioactive nickel to become the last element to be produced before collapse of a supernova leads to events that scatters this precursor radionuclide of iron into space.
The rulers of Mercia were generally the most powerful of the Anglo-Saxon kings from the mid-7th to the early 9th centuries, but are not accorded the title of bretwalda by the Chronicle, which is generally thought to be because of the anti-Mercian bias of the Chroniclers. The Annals of Wales continued to recognize the kings of Northumbria as 'Kings of the Saxons' (i.e. the English) until the death of Osred I of Northumbria in 716.
Bretw?lde was a term used in 11th and 12th century Ireland to denote the 'high king'. Part of the Gaelic lexicon, this spelling suggests a Germanic (Saxon) origin, as the 'w' is most likely pronounced as a 'v'. It is also possible that the term derives from the Welsh Brit Gweldig, the term for a ruler of Britain.Iron is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion in high-mass stars, where the production of nickel-56 (which decays to iron) is the last nuclear fusion reaction that is exothermic. This allows radioactive nickel to become the last element to be produced before collapse of a supernova leads to events that scatters this precursor radionuclide of iron into space.
Thursday, December 15, 2011
The "Fourth Party"
It was not until 1878 that he came to public notice as the exponent of a species of independent Conservatism. He made a series of furious attacks on Sir Stafford Northcote, R. A. Cross, and other prominent members of the "old gang". George Sclater-Booth (afterwards 1st Baron Basing), President of the Local Government Board, was a specific target, and the minister's County Government Bill was fiercely denounced as the "crowning dishonour to Tory principles", and the "supreme violation of political honesty". Lord Randolph's attitude, and the vituperative fluency of his invective, made him a parliamentary figure of some importance before the dissolution of the 1874 parliament, though he was not yet taken quite seriously.
In the new parliament of 1880 he speedily began to play a more notable role. Along with Sir Henry Drummond-Wolff, Sir John Gorst and occasionally Arthur Balfour, he made himself known as the audacious opponent of the Liberal administration and the unsparing critic of the Conservative front bench. The "fourth party", as it was nicknamed, at first did little damage to the government, but awakened the opposition from its apathy; Churchill roused the Conservatives by leading resistance to Charles Bradlaugh, the member for Northampton, who, though an avowed atheist or agnostic, was prepared to take the parliamentary oath. Sir Stafford Northcote, the Conservative leader in the Lower House, was forced to take a strong line on this difficult question by the energy of the fourth party. The long controversy over Bradlaugh's seat, showed that Lord Randolph Churchill was a parliamentary champion who added to his audacity much tactical skill and shrewdness. He continued to play a conspicuous part throughout the parliament of 1880 to 1885, targeting William Ewart Gladstone as well as the Conservative front bench, some of whose members, particularly Sir Richard Cross and William Henry Smith, he singled out for attack.
From the beginning of the Egyptian imbroglio Lord Randolph was emphatically opposed to almost every step taken by the government. He declared that the suppression of Urabi Pasha's rebellion was an error, and the restoration of the khedive's authority a crime. He called Gladstone the "Moloch of Midlothian", for whom torrents of blood had been shed in Africa. He was equally severe on the domestic policy of the administration, and was particularly bitter in his criticism of the Kilmainham Treaty and the rapprochement between the Gladstonians and the Parnellites.
passage of time
In the new parliament of 1880 he speedily began to play a more notable role. Along with Sir Henry Drummond-Wolff, Sir John Gorst and occasionally Arthur Balfour, he made himself known as the audacious opponent of the Liberal administration and the unsparing critic of the Conservative front bench. The "fourth party", as it was nicknamed, at first did little damage to the government, but awakened the opposition from its apathy; Churchill roused the Conservatives by leading resistance to Charles Bradlaugh, the member for Northampton, who, though an avowed atheist or agnostic, was prepared to take the parliamentary oath. Sir Stafford Northcote, the Conservative leader in the Lower House, was forced to take a strong line on this difficult question by the energy of the fourth party. The long controversy over Bradlaugh's seat, showed that Lord Randolph Churchill was a parliamentary champion who added to his audacity much tactical skill and shrewdness. He continued to play a conspicuous part throughout the parliament of 1880 to 1885, targeting William Ewart Gladstone as well as the Conservative front bench, some of whose members, particularly Sir Richard Cross and William Henry Smith, he singled out for attack.
From the beginning of the Egyptian imbroglio Lord Randolph was emphatically opposed to almost every step taken by the government. He declared that the suppression of Urabi Pasha's rebellion was an error, and the restoration of the khedive's authority a crime. He called Gladstone the "Moloch of Midlothian", for whom torrents of blood had been shed in Africa. He was equally severe on the domestic policy of the administration, and was particularly bitter in his criticism of the Kilmainham Treaty and the rapprochement between the Gladstonians and the Parnellites.
passage of time
Tuesday, December 13, 2011
Transcendence (religion)
In religion transcendence refers to the aspect of God's nature which is wholly independent of (and removed from) the physical universe. This is contrasted with immanence where God is fully present in the physical world and thus accessible to creatures in various ways. In religious experience transcendence is a state of being that has overcome the limitations of physical existence and by some definitions has also become independent of it. This is typically manifested in prayer, séance, meditation, psychedelics and paranormal "visions". It is affirmed in the concept of the divine in the major religious traditions, and contrasts with the notion of God, or the Absolute, existing exclusively in the physical order (immanentism), or indistinguishable from it (pantheism). Transcendence can be attributed to the divine not only in its being, but also in its knowledge. Thus, God transcends the universe, but also transcends knowledge (is beyond the grasp of the human mind). Although transcendence is defined as the opposite of immanence, the two are not necessarily mutually exclusive. Some theologians and metaphysicians of the great religious traditions affirm that God, or Brahman, is both within and beyond the universe (panentheism); in it, but not of it; simultaneously pervading it and surpassing it.
passage of time
passage of time
Monday, December 12, 2011
Week News Abstract For SFP Series in 10GTEK: Daily Mail
The Daily Mail is a British daily middle-market tabloid newspaper owned by the Daily Mail and General Trust. First published in 1896 by Lord Northcliffe, it is the United Kingdom's second biggest-selling daily newspaper after The Sun. Its sister paper The Mail on Sunday was launched in 1982. Scottish and Irish editions of the daily paper were launched in 1947 and 2006 respectively. The Daily Mail was Britain's first daily newspaper aimed at the newly literate "lower-middle class market resulting from mass education, combining a low retail price with plenty of competitions, prizes and promotional gimmicks", and the first British paper to sell a million copies a day. It was, from the outset, a newspaper for women, being the first to provide features especially for them, and is still the only British newspaper whose readership is more than 50% female.
In 1969, IPC decided to sell. The tycoon Robert Maxwell, eager to buy a British newspaper, offered to take it off their hands and retain its commitment to the Labour party, but admitted there would be redundancies, especially among the printers. Rupert Murdoch had bought the News of the World, a sensationalist Sunday newspaper, the previous year, but the presses in the basement of his building in London's Bouverie Street sat idle six days a week.
passage of time
In 1969, IPC decided to sell. The tycoon Robert Maxwell, eager to buy a British newspaper, offered to take it off their hands and retain its commitment to the Labour party, but admitted there would be redundancies, especially among the printers. Rupert Murdoch had bought the News of the World, a sensationalist Sunday newspaper, the previous year, but the presses in the basement of his building in London's Bouverie Street sat idle six days a week.
passage of time
Thursday, December 8, 2011
Week News Abstract For SFP Series in 10GTEK: Wal-Mart camel
The 10th millennium BC marks the beginning of the Mesolithic and Epipaleolithic period, which is the first part of the Holocene epoch. Agriculture, based on the cultivation of primitive forms of millet and rice, occurred in Southwest Asia. Although agriculture was being developed in the Fertile Crescent, it would not be widely practised for another 2,000 years.[citation needed]
The world population is estimated as between one and ten million people, most of whom were hunter-gatherer communities scattered over all continents except Antarctica and Zealandia. The Würm glaciation ended, and the beginning interglacial, which endures to this day, allowed the re-settlement of northern regions. The most recent glacial ended c. 10,000 BC, and the world entered a period of global warming.
The Wal-Mart camel is the fossil of a prehistoric camel (Camelops sp.) found at a Wal-Mart construction site in Mesa, Arizona in 2007. Workers digging a hole for an ornamental citrus tree found the bones of two (juvenile and infant) animals that may have lived as long as 10,000 years ago. Arizona State University Geology Museum curator Brad Archer calls it an important and rare find for the area.Wal-Mart officials and Greenfield Citrus Nursery owner John Babiarz whose crew discovered the remains agreed that the bones will go directly to the Geology Museum at Arizona State University where further research and restoration of the fossils could be done. Camels lived in what is now Arizona until about 8,000 years ago.More camel bones were found in Gilbert, Arizona in May 2008.
passage of time
The world population is estimated as between one and ten million people, most of whom were hunter-gatherer communities scattered over all continents except Antarctica and Zealandia. The Würm glaciation ended, and the beginning interglacial, which endures to this day, allowed the re-settlement of northern regions. The most recent glacial ended c. 10,000 BC, and the world entered a period of global warming.
The Wal-Mart camel is the fossil of a prehistoric camel (Camelops sp.) found at a Wal-Mart construction site in Mesa, Arizona in 2007. Workers digging a hole for an ornamental citrus tree found the bones of two (juvenile and infant) animals that may have lived as long as 10,000 years ago. Arizona State University Geology Museum curator Brad Archer calls it an important and rare find for the area.Wal-Mart officials and Greenfield Citrus Nursery owner John Babiarz whose crew discovered the remains agreed that the bones will go directly to the Geology Museum at Arizona State University where further research and restoration of the fossils could be done. Camels lived in what is now Arizona until about 8,000 years ago.More camel bones were found in Gilbert, Arizona in May 2008.
passage of time
Tuesday, December 6, 2011
Business case
A business case captures the reasoning for initiating a project or task. It is often presented in a well-structured written document, but may also sometimes come in the form of a short verbal argument or presentation. The logic of the business case is that, whenever resources such as money or effort are consumed, they should be in support of a specific business need. An example could be that a software upgrade might improve system performance, but the "business case" is that better performance would improve customer satisfaction, require less task processing time, or reduce system maintenance costs. A compelling business case adequately captures both the quantifiable and unquantifiable characteristics of a proposed project.
Business cases can range from comprehensive and highly structured, as required by formal project management methodologies, to informal and brief. Information included in a formal business case could be the background of the project, the expected business benefits, the options considered (with reasons for rejecting or carrying forward each option), the expected costs of the project, a gap analysis and the expected risks. Consideration should also be given to the option of doing nothing including the costs and risks of inactivity. From this information, the justification for the project is derived. Note that it is not the job of the project manager to build the business case, this task is usually the responsibility of stakeholders and sponsors.
passage of time
Business cases can range from comprehensive and highly structured, as required by formal project management methodologies, to informal and brief. Information included in a formal business case could be the background of the project, the expected business benefits, the options considered (with reasons for rejecting or carrying forward each option), the expected costs of the project, a gap analysis and the expected risks. Consideration should also be given to the option of doing nothing including the costs and risks of inactivity. From this information, the justification for the project is derived. Note that it is not the job of the project manager to build the business case, this task is usually the responsibility of stakeholders and sponsors.
passage of time
Sunday, December 4, 2011
Flycatching
The various methods of taking insects have been categorized as: gleaning (perched bird takes prey from branch or tree trunk), snatching (flying bird takes prey from ground or branch), hawking (bird leaves perch and takes prey from air), pouncing (bird drops to ground and takes prey) and pursuing (flying bird takes insects from air).
In hawking behavior, a bird will watch for prey from a suitable perch. When it spies potential prey, the bird will fly swiftly from its perch to catch the insect in its bill, then return to the perch or sometimes to a different perch. This maneuver is also called a "sally". Prey that is very small relative to the bird, such as gnats, may be consumed immediately while in flight, but larger prey, such as bees or moths, are usually brought back to a perch before being eaten. Sometimes the prey will attempt to escape and this can result in a fluttering pursuit before returning to the perch. Depending on the species of bird, there are observable variations on this behavior. Some species, such as the Olive-sided Flycatcher of North America and the Ashy Drongo of South Asia, tend to choose an exposed perch, such as a dead tree branch overlooking a clearing, whereas others, such as the North American Acadian Flycatcher[4] and the Asian Small Niltava perch within the cover of foliage deep in a forest or woodland habitat.
Many birds make use of a variety of tactics. A study of feeding behaviors in the family Tyrranidae categorized the following moves as ways of taking insect prey: aerial hawking (i.e. flycatching), perch-to-ground sallying, ground feeding (chasing after insects on the ground), perch-to-water sallying, sally-gleaning (can involve an hover-gleaning or a rapid strike), and gleaning while perched.Some tyrant flycatchers, such as those that choose a prominent perch from which to hawk insects, have more of a tendency to return to the same perch after each sally, while others, particularly those of the forest interior, show less of this tendency. A similar pattern is seen in Great Britain, where there are but two flycatchers, the Spotted Flycatcher and the Pied Flycatcher. The Spotted Flycatcher is the specialist, and tends to return to the same perch after each sally. The Pied Flycatcher is more of a generalist, gleaning as well as flycatching, and changes perches often.
Birds with the name "flycatcher" are not the only ones to engage in flycatching behavior. For example, Lewis's Woodpecker feeds by flycatching. Some honeyeaters of Australasia employ hawking and gleaning as feeding tactics. Bee-eaters catch bees in a similar manner and return to the perch to remove the sting before consuming. Furthermore, many small owls take insect prey on the wing; examples include the Western Screech Owl of North America and the Brown Boobook of Asia.
passage of time
In hawking behavior, a bird will watch for prey from a suitable perch. When it spies potential prey, the bird will fly swiftly from its perch to catch the insect in its bill, then return to the perch or sometimes to a different perch. This maneuver is also called a "sally". Prey that is very small relative to the bird, such as gnats, may be consumed immediately while in flight, but larger prey, such as bees or moths, are usually brought back to a perch before being eaten. Sometimes the prey will attempt to escape and this can result in a fluttering pursuit before returning to the perch. Depending on the species of bird, there are observable variations on this behavior. Some species, such as the Olive-sided Flycatcher of North America and the Ashy Drongo of South Asia, tend to choose an exposed perch, such as a dead tree branch overlooking a clearing, whereas others, such as the North American Acadian Flycatcher[4] and the Asian Small Niltava perch within the cover of foliage deep in a forest or woodland habitat.
Many birds make use of a variety of tactics. A study of feeding behaviors in the family Tyrranidae categorized the following moves as ways of taking insect prey: aerial hawking (i.e. flycatching), perch-to-ground sallying, ground feeding (chasing after insects on the ground), perch-to-water sallying, sally-gleaning (can involve an hover-gleaning or a rapid strike), and gleaning while perched.Some tyrant flycatchers, such as those that choose a prominent perch from which to hawk insects, have more of a tendency to return to the same perch after each sally, while others, particularly those of the forest interior, show less of this tendency. A similar pattern is seen in Great Britain, where there are but two flycatchers, the Spotted Flycatcher and the Pied Flycatcher. The Spotted Flycatcher is the specialist, and tends to return to the same perch after each sally. The Pied Flycatcher is more of a generalist, gleaning as well as flycatching, and changes perches often.
Birds with the name "flycatcher" are not the only ones to engage in flycatching behavior. For example, Lewis's Woodpecker feeds by flycatching. Some honeyeaters of Australasia employ hawking and gleaning as feeding tactics. Bee-eaters catch bees in a similar manner and return to the perch to remove the sting before consuming. Furthermore, many small owls take insect prey on the wing; examples include the Western Screech Owl of North America and the Brown Boobook of Asia.
passage of time
Thursday, December 1, 2011
Southern Ocean
The Southern Ocean (also known as the Great Southern Ocean, the Antarctic Ocean, and the South Polar Ocean) comprises the southernmost waters of the World Ocean, generally taken to be south of 60°S latitude and encircling Antarctica. It is usually regarded as the fourth-largest of the five principal oceanic divisions. This ocean zone is where cold, northward flowing waters from the Antarctic mix with warmer sub-Antarctic waters.
Geographers disagree on the Southern Ocean's northern boundary or even its existence, with many considering the waters part of the Pacific, Atlantic, and Indian Oceans instead. Others regard the Antarctic Convergence, an ocean zone which fluctuates seasonally, as separating the Southern Ocean from other oceans, rather than the 60th parallel.Australian authorities regard the Southern Ocean as lying immediately south of Australia.
The International Hydrographic Organization (IHO) has not yet ratified its 2000 definition of the ocean as being south of 60°S. Its latest published definition of oceans dates from 1953; this does not include the Southern Ocean. However, the more recent definition is used by the IHO and others.
passage of time
Geographers disagree on the Southern Ocean's northern boundary or even its existence, with many considering the waters part of the Pacific, Atlantic, and Indian Oceans instead. Others regard the Antarctic Convergence, an ocean zone which fluctuates seasonally, as separating the Southern Ocean from other oceans, rather than the 60th parallel.Australian authorities regard the Southern Ocean as lying immediately south of Australia.
The International Hydrographic Organization (IHO) has not yet ratified its 2000 definition of the ocean as being south of 60°S. Its latest published definition of oceans dates from 1953; this does not include the Southern Ocean. However, the more recent definition is used by the IHO and others.
passage of time
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