Dolphins live and hunt in large social groups called pods, and they communicate with each other using high-pitched clicks and ...

While the statement doesn’t name a specific mammoth species, the tusk might have belonged to a Columbian mammoth, a distant cousin of the more familiar woolly mammoth. The shaggy elephantine animal ...

It also shows that these arboreal mammals -- an extinct family known as mixodectids -- and humans occupy relatively close branches on the evolutionary tree. "A 62-million-year-old skeleton of this ...