Coconut crab

Birgus latro

A true beast of a crab, the coconut crab can grow to 16in (41cm) in length, 3ft (90cm) in width and weigh up to 9lbs (4.1kg). Its claws are powerful enough to crack open coconuts but it does also eat other things such as leaves and fruit. It will also eat rats, chickens and even other coconut crabs.