Paleontologist Thaís Pansani standing in front of a reconstructed giant ground sloth skeleton at the Smithsonian National Museum of Natural History. AP SAO PAULO (Associated Press) — Sloths weren’t ...

Imagine a sloth. You probably picture a medium-sized, tree-dwelling creature hanging from a branch. Today's sloths—commonly featured on children's backpacks, stationery and lunch boxes—are slow-moving ...

For years, paleontologists debated the timeline for recovery following the devastating end-Permian mass extinction (the ...

More than 30,000 teeth, bones and other fossils from a 249 million-year-old community of extinct marine reptiles, amphibians, bony fish and sharks have been discovered on the remote Arctic island of ...

A fossil skull of a prehistoric amphibian, found in a 230-million-year-old burrow in Wyoming, turned out to be from an unknown species. David Lovelace In prehistoric times, western Wyoming was a land ...

A 161 million-year-old fossil, linked to a line of extinct frog-like amphibians, is the oldest tadpole ever found. By Asher Elbein The metamorphosis of a frog from baby to adult is one of nature’s ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Imagine a sloth. You probably picture a medium-size, tree-dwelling creature hanging ...

Larisa R. G. DeSantis received funding from the National Science Foundation, the Guggenheim Foundation, and Vanderbilt University. DeSantis is also a research associate at the La Brea Tar Pits and ...