A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Cat families usually play best in even numbers. Cats and kittens should be acquired in pairs whenever possible!
156
Two dogs were among the Titanic survivors.
262