crayfish in autumn. signal crayfish, pacifastacus leniusculus, in colorful maple leaves showing claws. north american crayfish

abdomen america animal antenna autumn britain brook california claws closeup colorful crayfish creek crustacean czech detail europe exoskeleton finland food freshwater germany great idaho invasive japan lake leaves leniusculus lobster maple natural nature nocturnal north oregon pacifastacus party pincers plague portrait river signal spain sweden unpolluted washington water wild wildlife yellow