Narrator: Lions have them, hippos have them, and even you and I have them: canines, those long, pointy front teeth. They're actually the longest teeth in the human mouth. So what are these long ...

The fossil teeth showed signs of delayed development ... Overall, the findings suggest that Homo species evolved to have longer childhoods to spend more time learning about social behavior ...

Sabre teeth can be ideal for puncturing the flesh of prey, which may explain why they evolved in different groups of mammals at least five times ...