Ancient reptile tracks unearthed
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The earliest evidence for the existence of reptiles is found in  rocks dating back 315 million years.
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Fossils  uncovered in New Mexico  show dinosaurs co-existed with a closely related group of reptiles for millions  of years before overtaking them to become the dominant land animals on Earth.
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A Mexican man has discovered dozens of dinosaur footprints dating back up to 110 million years along the banks of a dried river, scientists said on Tuesday.
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A dino-era graveyard of large, predatory sea reptiles has been found by fossil hunters, including the remains of an estimated 33-foot-long (10-meter-long) beast dubbed "the Monster."&#149; Arctic sea monster images >>
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CALGARY, Alberta - A fossilized jaw found in an Alberta gravel pit may have cleared up a mystery for researchers wondering how brown bears originally made it across North America.
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Fossilized foot marks left by a big  meat-eater on a lake bed in northern Spain 125 million years  ago provide strong evidence that at least some dinosaurs were  good swimmers, scientists said on Thursday.
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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.
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Scientists have unearthed the remains of a perfectly preserved 130 million-year-old new species of dinosaur which provide a first-ever look at how the prehistoric creatures slept.
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A fossilized jaw found in an Alberta gravel pit may have cleared up a mystery for researchers wondering how brown bears originally made it across North America.
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Researchers on Thursday announced the discovery of the remains of a short-necked plesiosaur, a prehistoric marine reptile the size of a bus, that they believe is the first complete skeleton ever found.
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The extinction of the dinosaurs 65 million years ago can be traced to a collision between two monster rocks in the asteroid belt nearly 100 million years earlier, scientists report on Wednesday.
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Underwater footprints reveal that some dinosaurs were capable of swimming, scientists report.
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SPACE.com / Insect bite marks in ancient leaf fossils are shedding new light on how nature bounced back after an asteroid impact killed off the dinosaurs and much of life on Earth 65 million years ago.
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French and Chinese paleontologists have identified the fossil of a two-headed reptile from a species that lived in what is now China nearly 150 million years ago.
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The fossil of a big-eyed, fishlike reptile that lived 100 million years ago was discovered in a box that had been stashed away in a Canadian lab for 25 years.
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Near the sprawl of the Capital Beltway, an amateur paleontologist found what he says are the first footprints ever uncovered of a 6-foot-long plant-eating dinosaur that roamed the Earth about 100 million years ago.
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Geologists unveiled a fossil discovery on Tuesday they believe will help resolve a long-standing mystery over whether dinosaurs ever roamed to what is now Canada's Pacific coast.