Scientific name -- Callinectes colossus
Size -- 8000+ lbs.
Diet -- giant mollusks

During Heracles' battle with the hydra, Hera summoned a crab to attack Heracles and aid the hydra. Although Heracles defeated both hydra and crab, Hera rewarded the crustacean by placing it as a constellation up in the night sky. Latin for "crab" is "cancer," and in Greek it is "Karkinos" -- from where derives the word "carcinogen."