Ancient penguins waddled, swam in warm locales
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Penguins were waddling and swimming  in warm locales tens of millions of years earlier than  previously thought, according to scientists who described on  Monday fossils of two previously unknown types found in Peru.
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The ice-cloaked Arctic Ocean was once apparently a warm, biologically brewing basin, scientists say.
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A spectacularly quirky creature with  long, curved spines protruding from its armored body prowled  the ocean floor half a billion years ago near the dawn of  complex life forms on Earth, scientists said.
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Science & environment: Small deer-like animal that waded in lagoons 10 million years ago may have evolved into the modern whale
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Fossils suggest a worldwide cold spell millions of years ago caused the extinction of many cold-blooded animals in North America, thanks to a reverse greenhouse effect.
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Norwegian scientists report finding a  treasure trove  of fossils belonging to giant sea reptiles that once roamed the Arctic sea about 150 million years ago.Comment
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LIMA, Peru  - Even in ancient Peru, it seems dogs were a man's best friend.
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The ancient family tree where all the world&#39;s birds perch is getting bigger, odder and older, scientists announced Wednesday. In a report in Thursday&#39;s issue of the journal Nature, paleontologists
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LONDON - The earliest known relative of the mighty Tyrannosaurus rex had primitive feathers, probably to help it keep warm. Researchers at the Chinese Academy of Sciences in Beijing found the remains of the
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A fossilized bird embryo with feathers was found in northeastern China, which may be evidence that early birds were more developed at birth than their modern ancestors, according to a study in the journal Science.
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Nifty Icebergs, released by global warming from the icy embrace of Antarctica, have surprised scientists by playing host to many forms of life.â¦
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MCMURDO STATION, Antarctica  - The first Adelie penguin chicks of the season -- black fluffballs small enough to hold in the hand -- started hatching this month, and the simple fact that there are more of them in the south and fewer of them further north is a sign of global warming, scientists say.
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Ice cores drilled from under the floor of the Arctic Ocean show it was once warm enough for swimming.
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Ducks may have been paddling about in primeval swamps when Tyrannosaurus rex was king of the dinosaurs, scientists report in Nature.
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The fossilized neck bones of a 230-million-year-old sea creature have features suggesting that the animal&#39;s snakelike throat could flare open and create suction that would pull in prey.
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During the age of dinosaurs, tiny squirrel-like creatures climbed trees and jumped into the darkness. Then they spread their limbs and glided away &#151; the first known mammals to take to the air, a new report says.
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Twelve footprints found in the bed of an ancient lake in northern Spain have thrown up the first compelling evidence that some land dinosaurs could swim, researchers reported Thursday.