Oregon's Past Revealed: Whales of Deep Time June 12, 2010

Fifty-four million years ago, after the extinction of dinosaurs, the earliest known relatives of whales lived on land. These four-legged ancestors were far different from the hairless streamlined swimmers we call whales today. Over millions of years, the bodies of these early ancestors adapted to life in the water. Learn about these transformations as you explore the evolution of these fascinating creatures.