Nova Scotia, Lobster precisely half albino, also a hermaphrodite - male on one side and female on the other. Lobsters develop independently on each side of the body, which accounts for the two different claws and bizarre patterns.
Giant spider crab* The largest crab on earth lives up to below sea level, and can measure up to from claw tip to claw tip. Why they are terrifying: Have you ever been nipped by a normal-sized crab? It hurts. A giant crab would probably nip your toe off.