Just like the little crabs, but bigger and made of paper mache.
Mutated by atomic tests the giant crabs are found on a remote island.
From the depths of the sea… a tidal wave of terror! These giant mutated crabs aren’t your run of the mill dumb crabs. These crabs got psychic communication by eating the brains of the scientists from the island. They will lure you into their caves with their psychic power by using the voices of their past victims.
The Crab Monsters are the brain child of the former King of the Drive-Ins Roger Corman.
From the movie:
Attack of the Crab Monsters (1957)