Washington Post:

Meet the oldest living vertebrate: a shark you've probably never heard of.

Greenlanders consider their local shark species — Somniosus microcephalus — to be something of a nuisance. The carnivorous creature, nearly the same size as the Great White when fully grown, has a habit of getting tangled up in long fishing lines designed to catch halibut. If caught and killed, the shark must be dried out before its meat can be eaten or given to sled dogs, as high quantities of toxins in the animal's muscle cause something like drunkenness.

Go to link