Do all animals have teeth?

Not all animals have teeth because a austrailian spiny anteater only has a tongue. BIrds like anteaters,baleen whales and turtle dont have teeth.But this wasn always the case. The common ancestor of living birds sported of a set of pearly whites of 116 millon years ago.

A Anteater tonuge is long and sticky, and covered with spines.When it gets hungry, the anteater flicks it's tonuge deep inside an ant colony, and the ants are glued to the sticky surface.By fishing for ants this way, the anteater can collect up 30,000 ants a day! It does need some way of crushing up all these insects, but instead of teeth the ants are groud against hard growths inside anteater's mouth.