Researchers found a "ghost population" that interbred with the ancestors of modern humans.
309 million years ago an animal that resembled a lizard wrapped its tail around a younger member of its species.
The bigger the whale, the tougher it is to find a decent meal.
The water contains bacterialike shapes that researchers plan to test for DNA.
A new study shows that the Inuit brought dogs with them when settling North America, and these dogs’ descendants are still working today.
Cowbirds outsource parenting to other species, but an innate password tells their children to copy cowbird songs.