Rat teeth score 5.5 on Mohr's scale of hardness -- which is harder than steel! Exterminators now add glass to concrete when they patch holes to discourage rats from chewing through - the glass ...

Open wide. A Facebook post has achieved viral status after including photos of a fish that appears to have rows of human-like teeth. According to the Charlotte Observer, the 9-pound sheepshead was … ...

A Facebook post has achieved viral status after including photos of a fish that appears to have rows of human-like teeth. According to the Charlotte Observer, the 9-pound sheepshead was caught off ...

The razor-sharp teeth belonged to conodonts, jawless vertebrates that evolved some 500 million years ago in the Precambrian eon and went extinct during the Triassic period, around 200 million ...

A 6 million-year-old creature that lacked sharp canines for fighting may be the first prehuman to have branched off from the ape line, researchers said Thursday. IE 11 is not supported.

An extinct primitive marine vertebrate had the sharpest dental structures ever known — with tips just one-twentieth of the width of a human hair, but able to apply pressures that could compete ...