The massive fangs found in viperfishes' mouths are up to 0.4 inches long. The teeth "take up half the length of their head," and are used to capture and impale their prey.

The wolverine, often referred to as the "devil's bear" or the "demon of the north," is one of nature's most fearsome and underestimated predators. This small yet mighty mustelid, measuring up to 1 ...

'Possessed' young man hisses like wild animal and bares his teeth as exorcist 'rids him of demon' The 23-year-old was filmed laughing manically, writhing and even trying to bite to exorcist ...

The idea of an ancient sea lizard with a demon's face and dagger-like teeth might sound like a work of science fiction. But it was a reality 66 million years ago, according to a new study.