american red crayfish procambarus clarkii with claws extended

action aggression aggressive america american anger arm attack biological biology carrier clarkii claw claws close combat crayfish crustacean dangerous defense destructive determination different exotic extended extendedinvasive fight fighter fighting fist freshness freshwater industry infection invertebrate killer muscle north opposition pest predator problem procambarus protection punch red self shellfish species stream strength summertime usa violence vitality wild wildlife zoology