They steal pots from humans and wear them as armor. Sometimes they’ll even use coconut husks as shells, as pictured below. They’ll also eat smaller crabs and have been known to eat rats.
The absolute worst thing about coconut crabs? They ate Amelia Earhart. It’s true! Recent discoveries suggest that coconut crabs ate her flesh and hoarded her bones in their crab burrows. Researchers hope that some of her remains can still be found in the crab burrows on Nikumaroro island, the desert island where she died. Below are some horrible pictures of these terrible things: