Coconut Crab: The Coconut Crab is the only species of the genus Birgus and is related to the terrestrial hermit crabs of the genus Coenobita ~ [Wikipedia]
The Giant Coconut Crab (Birgus latro) is the largest terrestrial arthropod in the world. It is known for its ability to crack coconuts with its strong pincers in order to eat the contents. This crab is more than 3 feet from head to tail and weighs up to 40 pounds, with a pair of large pincers strong enough to open coconuts.
Coconut crabs can grow up to 1 meter in length from leg tip to leg tip (Source)