This Japanese Spider Crab measures 10 feet from claw to claw and is still growing and could live until it is 100.  It has a body the size of a basketball and its legs can straddle a car.  They will eventually measure a massive 15 feet.

The crab's scientific name is Macrocheira kaempferi and it was caught by
fishermen in the Pacific Ocean and has now been imported to Britain
where it has gone on display at the National Sea Life Centre in
Birmingham.  The open topped ray tank has the icy cold waters Crabzilla needs and will be his home until the end of March. 

Out of the water, the crab looks limp and languid because it cannot support its heavy limbs but in its own habitat - up to 2,500ft down in the cold seas of the ocean - it is a lethal predator.  

However, it also has predators of its own  - humans - as it is considered a delicacy in Japan where they are usually salted and steamed but eating them in the spring is banned because that is when they lay their eggs.

Edited from The Daily Mail 11/2/10