Why do humans have canine teeth? Patrick McGannon, Surprise, Arizona All primate species have them, says Sabrina Sholts, a curator of physical anthropology at the Museum of Natural History.

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 video above shows this little otter already has canine teeth. Human babies generally do not begin teething until closer to six months, but permanent teeth will eventually replace their baby teeth.