A 14,000-year-old mummified puppy discovered in Siberia contained the unexpected remains of a woolly rhinoceros in its ...

The marsupial lion, which vanished around 40,000 years ago, was a muscular ambush predator about the size of a modern lion.

Deep beneath Kentucky’s rolling hills, in the dark reaches of Mammoth Cave National Park, paleontologists have unearthed the ...

Ancient collagen preserved in the bones of extinct Australian mammals is revealing their evolutionary relationships, leading to some surprises.