Olympicetus thalassodon is one of several that are helping us understand the early history and diversification of modern dolphins, porpoises and other toothed whales. Life reconstruction of Olympicetus thalassodon pursuing a school of fishes alongside plotopterid birds (background) somewhere in the eastern North Pacific Ocean. Image credit: Cullen Townsend. Olympicetus thalassodon swam along the North Pacific coastline around 28 million years ago...
