A father sea catfish keeps the eggs of his young in his mouth until they are ready to hatch. He will not eat until his young are born, which may take several weeks.
Hummingbirds are the smallest birds - so tiny that one of their enemies is an insect, the praying mantis.
Chameleons can move their eyes in two different directions at the same time.
A chimpanzee can learn to recognize itself in a mirror, but monkeys can't.