Sleeper shark

Sleepers sharks were a large species of shark found in the Sea of Moving Ice.

Description
These creatures were named for their sluggish movements, which were thought to be the result of poor eyesight caused by parasites.

Ecology
Sleeper sharks lived extraordinarily long lives.

Rumors & Legends
Though not proven, sleepers sharks were thought to grow slowly over the course of their lives and never stop growing.

Appearances

 * Video Games