Echidnas have a tiny mouth and a toothless jaw.

The toothless jaws have indicate to some a diet of eggs but these theropods more likely fed on plants or small vertebrates.

Also unusual was the combination of its toothless jaws and no bony head crest.

Bald heads and gray hair, wrinkles and toothless jaws.

It was a herbivore, biting off leaves with its toothless jaws.

The old man's toothless jaw worked.

The toothless jaws were first thought to be those of a bird.

His leathery forehead wrinkled, and he worked his nearly toothless jaw.

Some seemed to laugh, others to cry, their black tongues exposed between toothless jaws.

Its eyes glinted red; its tongue flicked in and out of toothless jaws.