Shark jaws and teeth aren't the only things that make sharks effective predators! Check out the pectoral fins on this Bull Shark in a video shot by the ASI's Resident Research Scientist Dr. Josh Moyer. As she swims up to collect a fish scrap, her pectoral fins are angled upwards. As soon as she has the scrap in her mouth, she changes the flow of water over her pectoral fins by angling the leading edge downward, and she pitches downward. Because pectoral fins direct flow to alter lift, biologists

Bull sharks have a surprising adaptability: they are able to move freely between salt and fresh water. Tune-in to five full weeks of Sharkfest on National Geographic every night at 8/7c—and available next day on Hulu. | National Geographic