They feed on mollusks, insects, arthropods, and small fish. They locate their prey using their sense of smell, and since having vestigial teeth, their primary feeding method is suctioning.
Coconut crabs have the strongest grip of all animals.
Hence their name, their pincers are capable of splitting a coconut. The grip strength of an adult male is about 300 N, in comparison, the grip strength of a coconut crab's pincers is more than 1700 N.