Bonnethead began with a taxon that had a highly pronounced cephalofoil (most likely that similar to the winghead shark, "Eusphyra blochii"), and was later modified through selective pressures. Thus, judging by their smaller cephalofoils, bonnethead sharks are the more recent developments of a 25-million-year evolutionary process. This species occurs off the American coast, in regions where the water is usually warmer than . It ranges from New England, where it is rare, to the Gulf of Mexico and Brazil, and from southern California to Ecuador. During the summer, it is common in the inshore waters of the Carolinas and Georgia; in
Revenge of the Creature debut of Clint Eastwood, who appears uncredited as a lab technician named Jennings early in the story. He is shown having a discussion with Professor Ferguson, accusing a test subject cat of eating a lab rat, only to find the rat in his lab coat pocket. Critically reviewed in "The New York Times", "Revenge of the Creature" was dismissed as a fourth-rate sequel with the comment, "... away we go, as before." Other than some interesting sequences involving the setting, "What is probably the most unusual aquarium in the world makes a nice, picturesque background indeed ..." the review was