A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The head of a jellyfish is called the "Bell."
6
Drivers kill more deer than hunters do.
660
Parrot parents "name" their children with a signature call.
112