Lynn M. Stone / White ibis (Eudocimus albus) in winter plumage, eating Atlantic blue crab (Callinectes sapidus), at edge of saltwater lagoon. St. Petersburg, Florida, USA (non-ex)

Lynn M. Stone / White ibis (Eudocimus albus) in winter plumage, eating Atlantic blue crab (Callinectes sapidus), at edge of saltwater lagoon. St. Petersburg, Florida, USA

Joel Sartore / Photo Ark / Turtle barnacle (Chelonibia testudinaria) on the shell of a Common blue crab (Callinectes sapidus) portrait, Gulf Specimen Marine Lab, Florida. Captive.

Shane Gross / Atlantic blue crab (Callinectes sapidus) hunting in Turtlegrass (Thalassia testudinum) seagrass bed, view towards sky. Florida Keys, Florida, USA.

Shane Gross / Lemon shark juvenile (Negaprion brevirostris) swimming in mangrove habitat near blue crab (Callinectes sapidus), a prey species for the shark. Eleuthera, Bahamas.