Once its prey is immobilized, the velvet worm cuts into it with razor-sharp jaws while injecting digestive ... take a moment to appreciate the tiny, slime-shooting relics beneath your feet.

Hagfishes don't have jaws, but they do have plates made of keratin (visible in this image) that they use instead. Image: NOAA Okeanos Explorer Program, NOAA Photo Library Hagfishes are unusual animals ...