University of Washington scientists have made a remarkable discovery: real teeth growing on the forehead of a deep-sea ratfish. This finding sheds light on the unique adaptations in fish anatomy, ...

Geese do not have true teeth, but their beaks and tongues are lined with serrated structures that function similarly in gripping and processing food. These keratin-based ridges help them pull and tear ...

Teeth first evolved as sensory organs, not for chewing, according to a new analysis of animal fossils. The first tooth-like structures seem to have been sensitive nodules on the skin of early fish ...