SALT LAKE CITY, Utah (KSL/CNN)-- It may have weighed only 2 1/2 pounds and stood about 6 inches tall, but the discovery of a half mammal, half reptile's skull in eastern Utah has huge implications for ...

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In most narratives, the story of evolution is the story of organisms emerging from the ocean and eventually populating the ...

Researchers have uncovered dozens of fossilized teeth in Kuwajima, Japan, and identified this as a new species of tritylodontid, an animal family that links the evolution of mammals from reptiles. The ...

Researchers have unearthed dozens of fossilized teeth in Kuwajima, Japan, which belong to an ancient mammal-like reptile that overlapped with some of the world's earliest mammals for millions of years ...

The discovery of the fossilized skull of a half-mammal and half-reptile creature may rewrite ancient history, specifically regarding the timeline for the breakup of the supercontinent Pangaea. The ...

The platypus (Ornithorhynchus anatinus), sometimes called the duck-billed platypus is native to Eastern Australia and Tasmania. It is the sole-surviving member of its family (Ornithorhynchidae) and ...

Compared with the rest of the animal kingdom, mammals have the biggest brains and produce some of the smallest litters of offspring. A newly described fossil of an extinct mammal relative -- and her ...

A cow munching on grass may not seem all that complicated, but when compared to reptiles, mammals have long been thought to have evolved the most complex and efficient method of chewing and processing ...

A replica fossil of the titanosaur _Patagotitan_, one of the largest dinosaurs ever discovered. It would have weighed about 70 tons (63.5 metric tons.) Spencer Platt/Getty Images News via Getty Images ...