The great gray whale migration is back on the Oregon coast. The massive migration of eastern North Pacific gray whales — the longest mammalian migration in the world — sees thousands of whales ...

Sperm whales are the largest toothed whales in the world, reaching 45 tons and living for decades. Their populations were imperiled by historic whaling practices and they are still considered rare ...

Its appetite hinges on nutrient-rich krill swarms, so climate shifts that shrink krill threaten energy reserves and migration. Read on to discover the 12-inch-thick throat muscles and a 90-second gulp ...