a crab is in a dangerous position exposed on the beach

animal antennae antennule backing beach caprus carapace catharus cephalothorax cheliped claw coast coastal compound crab creature crustaceans dactyl dactylus danger dangerous defense defensive element exposed eyes food foreshore frightened legs meal merus ocean one open out ovalipes pincer pincers place propodus ready rostrum sand sandy sea seafood seashore shore trouble vulnerable water wrong