Why Hammerhead Sharks Hold Their Breath

Scalloped hammerhead sharks are unusual because they are able to dive to depths of up to 2500 feet without endangering their lives. This has baffled researchers who note that the cold-blooded creatures cannot maintain their body temperature, so sharks typically cannot survive at those icy-cold depths. So how do hammerhead sharks do it? Listen to hear about a study of hammerhead behavior, and learn how the surprising findings challenged previously held beliefs about shark physiology.