By Chris Lukhaup; U.S. Fish and Wildlife Service Southeast Region (Lagniappe Crayfish) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
By Chris Lukhaup; U.S. Fish and Wildlife Service Southeast Region (Lagniappe Crayfish) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons