The Helicoprion puzzled scientists for years, who couldn't figure out where to place its spiral-shaped jaw loaded with teeth. 🌀 Dr. Nathan Lujan (Curator of Fishes) sheds some light on this mysterious, extinct shark. Learn more at Sharks, on now through March 22 (we also have a Helicoprion fossil on permanent display in our Dawn of Life Gallery!). Sharks is organized by American Museum of Natural History, New York. The Museum gratefully acknowledges Warner Bros. Discovery for its generous suppo