A new study by University of Alberta paleontologists shows that one type of ancient reptiles evolved a special type of tooth enamel, similar to that of mammals, with high resistance to wear and tear.

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 ...

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 ...

CISCO, Utah - A new mammal that is similar to a reptile was discovered in Cisco, Utah, and it is changing the way scientists are viewing history. Paleontologists discovered the uncrushed skull in 2006 ...

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 ...

Despite evidence that the earliest examples of creatures such as mammals and reptiles gave birth to live young, they actually may have laid eggs, a scientist argues. "These eggs are probably out there ...

Earth’s earliest mammals spent their lives at a more leisurely pace than their modern counterparts, but they lived a lot longer, analysis of some 200-million-year-old teeth has shown. Using X-ray ...

Two weird, mammal-like reptiles that sort of looked like scaly rats, each smaller than a loaf of bread, roamed ancient Brazil about 235 million years ago, likely dining on insects the predators ...

Some of these giant vegetarians were as tall as a 3-story building. Microscopic analysis of their teeth, bones and eggshells ...