Claim: Photographs show Christmas Island robber crab or coconut crab.
Status: Partly true : The origins and authenticity of the photographs have not been verified, but there really are coconut crabs which can reach a leg span of 3.3 ft, a body length of 1.3 ft and weigh up to 38 pounds.
Reference: Snopes
See the Pet Blog's other entries on animal related internet hoaxes.