The colossal squid has the largest eyes in the world.
4
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
Early American humans hunted car-size armadillos and used their shells for houses.
12
Cats lose almost as much fluid in the saliva while grooming themselves as they do through urination!
205
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6