a field crab parathelphusa convexa is ready to attack a crayfish cherax quadricarinatus when they meet on a moss-covered rock

animal animals aquarium attack australia black both cherax claw color colorful conservation convexa crab crawfish crayfish crustacean delicacy ecuador eye eyes field fish food fresh freshwater galapagos healthy isolated life lobster luxury macro meat meet mosscovered mud nature ocean orange parathelphusa pet pincers prawn prey protection quadricarinatus ready red river rock sand seafood shellfish shrimp small these they tropical water when wild wildlife