Orcas, or killer whales, are the largest members of the dolphin family. They are apex predators and prey upon fish and large mammals such as seals and baleen whale calves. They can be found in oceans throughout the world. These social creatures received their nickname because of their tendency to attack other whale species, and captive killer whales have been known to attack humans. This book covers key information about orcas, including life cycle, anatomy, and the history of the species' interaction with humans. Accessible text and fact boxes make this an ideal book for young readers interested in diving into the deep with these expert hunters.