企鹅英语简介
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发布时间:2022-05-29 19:02
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热心网友
时间:2023-11-07 15:06
March of the Penguins
简介:
Each winter, alone in the pitiless ice deserts of Antarctica, deep in the most inhospitable terrain on Earth, a truly remarkable journey takes place as it has done for millennia. Emperor penguins in their thousands abandon the deep blue security of their ocean home and clamber onto the frozen ice to begin their long journey into a region so bleak, so extreme, it supports no other wildlife at this time of year. In single file, the penguins march blinded by blizzards, buffeted by gale force winds. Guided by instinct, by the otherworldly radiance of the Southern Cross, they head unerringly for their traditional breeding ground where--after a ritual courtship of intricate dances and delicate maneuvering, accompanied by a cacophony of ecstatic song--they will pair off into monogamous couples and mate. The females remain long enough only to lay a single egg. Once this is accomplished, exhausted by weeks without nourishment, they begin their return journey across the ice-field to the fish-filled seas. The male emperors are left behind to guard and hatch the precious eggs, which they cradle at all times on top of their feet. After two long months ring which the males eat nothing, the eggs begin to hatch. Once they have emerged into their ghostly white new world, the chicks can not survive for long on their fathers' limited food reserves. If their mothers are late returning from the ocean with food, the newly-hatched young will die. Once the families are reunited, the roles reverse, the mothers remaining with their new young while their mates head, exhausted and starved, for the sea, and food. While the alts fish, the chicks face the ever-present threat of attack by prowling giant petrels. As the weather grows warmer and the ice floes finally begin to crack and melt, the alts will repeat their arous journey countless times, marching many hundreds of miles over some of the most treacherous territory on Earth, until the chicks are ready to take their first faltering dive into the deep blue waters of the Antarctic.
参考资料:http://zhidao.baidu.com/question/22283708.html
热心网友
时间:2023-11-07 15:07
Penguins 企鹅
Penguins are birds highly adapted for marine life, having a shape that enables extreme agility underwater. They also have a waterproof coat of dense feathers and a well developed layer of fat for insulation.
All penguin species are restricted to the Southern Hemisphere, but the greatest numerical concentrations are on Antarctic coasts and sub-Antarctic islands.
Gentoo (Pygoscelis papua)(sub-antarctic islands), adélie (Pygoscelis adeliae)(Antarctic coasts) and chinstrap penguins (Pygoscelis antarctica) (Antarctic Peninsula) breed in the southern spring. Females lay only one egg usually and males share in incubation and chick rearing. Predation by brown skuas and sheathbills is a major cause of egg and chick loss, though complete breeding failure can occur at times of low food availability.
Two migratory species of crested penguins, the macaroni (Eudyptes chrysolophus) and rockhopper (Eudyptes chrysocome), breed on sub-antarctic islands. Crested penguins are unique in that the first of two eggs in a clutch is always smaller than the second. The smaller egg rarely hatches and only one chick is raised
King penguins (Aptenodytes patagonicus) also breed on sub-Antarctic islands in large colonies, though with territorial spacing. Alts incubate a single egg and brood the chick resting on their feet. In contrast, emperor penguins (Aptenodytes forsteri) form colonies on sea ice at the edges of the Antarctic continent and breed ring the Antarctic winter. Physiological adaptations and congregating in large crèches enables them to withstand the harsh conditions.
The main prey of penguins are fish, squid and crustaceans, with variation of diet occurring within the feeding regimes of different species. Duration of feeding trips and diving performance also varies between species.
Most species of Antarctic penguin are abundant and not seriously threatened by man's activities. However rockhopper and macaroni penguin populations have decreased substantially in recent years though without obvious cause. In addition there remain concerns that Southern Ocean krill fisheries could compete with penguins for food, particularly ring the breeding season.
热心网友
时间:2023-11-07 15:07
Penguins are flightless birds belonging to the family Spheniscidae. World-wide there are 17 species of penguin, all of which breed in the Southern hemisphere. The name is believed to have originated from the Welsh "pen gwyn" which means white head. The name was originally applied to Great Auks, which are flightless birds that lived in the northern hemisphere, before being hunted to extinction in the 19th Century. Great Auks looked similar to penguins, and were also unable to fly, which is why they were killed off so easily by sailors who used them for food.
选自Introction to Penguins ,挺长的一篇文章
参考资料:http://www.penguins.cl/penguins-intro.htm
热心网友
时间:2023-11-07 15:08
Penguins
Penguins are birds highly adapted for marine life, having a shape that enables extreme agility underwater. They also have a waterproof coat of dense feathers and a well developed layer of fat for insulation.
All penguin species are restricted to the Southern Hemisphere, but the greatest numerical concentrations are on Antarctic coasts and sub-Antarctic islands.
Gentoo (Pygoscelis papua)(sub-antarctic islands), adélie (Pygoscelis adeliae)(Antarctic coasts) and chinstrap penguins (Pygoscelis antarctica) (Antarctic Peninsula) breed in the southern spring. Females lay only one egg usually and males share in incubation and chick rearing. Predation by brown skuas and sheathbills is a major cause of egg and chick loss, though complete breeding failure can occur at times of low food availability.
Two migratory species of crested penguins, the macaroni (Eudyptes chrysolophus) and rockhopper (Eudyptes chrysocome), breed on sub-antarctic islands. Crested penguins are unique in that the first of two eggs in a clutch is always smaller than the second. The smaller egg rarely hatches and only one chick is raised
King penguins (Aptenodytes patagonicus) also breed on sub-Antarctic islands in large colonies, though with territorial spacing. Alts incubate a single egg and brood the chick resting on their feet. In contrast, emperor penguins (Aptenodytes forsteri) form colonies on sea ice at the edges of the Antarctic continent and breed ring the Antarctic winter. Physiological adaptations and congregating in large crèches enables them to withstand the harsh conditions.
The main prey of penguins are fish, squid and crustaceans, with variation of diet occurring within the feeding regimes of different species. Duration of feeding trips and diving performance also varies between species.
Most species of Antarctic penguin are abundant and not seriously threatened by man's activities. However rockhopper and macaroni penguin populations have decreased substantially in recent years (though without obvious cause). In addition there remain concerns that Southern Ocean krill fisheries could compete with penguins for food, particularly ring the breeding season.
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