Scientist have used a novel way of ageing sharks [that involves eyeballs] to figure out just how old Greenlandsharks get, and the results are: they can get olde than your grandparents, and maybe even older than any other vertebrate on earth.

Ommatokoita Copepods are number 1 on The Most Extreme Odd Couples (paired with Greenland Shark). They are parasites that live on the Greenland sharks eye, scraping its cornea. However though, the shark has a keen sense of smell, and can locate food without their eye. Little do they know that they are actually helping the shark, by acting as a fishing lure. They look like worms, which attracts fish, which is how one of the slowest sharks in the world is able to eat fast moving fish such as Salmon. In the freezing waters of the arctic, a fishing lure is more important than seeing.