Earth looked much different not just millions, but even decades and centuries ago. Many animal species that once existed are ...

The world is a harsh place, and all living things are constantly evolving to try to survive. Unfortunately, as the world changes, some animals just can’t evolve quickly enough to make it, and they go ...

Scientists have analyzed ancient DNA and compared more than 400 fossils from 17 natural history museums to figure out how and why extinct sloths got so big. Most of us are familiar sloths, the ...