Interactive graphic: Killer whales of the Pacific Northwest

Did you know that orcas are actually not whales, but the world's largest dolphins? They got the name of killer whale from whalers who saw firsthand orcas' attacks on whales.

Puget Sound is home to both resident and transient populations of orcas. The animals are closely studied, and some are considered endangered.

Learn more about orcas by clicking on the animated graphic above.