Sheep, goats, octopuses, and toads have rectangular pupils.
7
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
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
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6