The animal with the largest brain in proportion to its size is the ant. They are the smartest species of insects with about 250,000 brain cells. See more

There is a species of bird, Antpitta avis canis Ridgley, that barks like a dog. See more

99% of all animal species that ever lived on Earth are now extinct. See more

Humans, bonobo monkeys, and dolphins are the only species that have sex for pleasure. See more

Bees can see ultraviolet light. See more