An ancient biosonar sheds new light on the evolution of echolocation in toothed whales

Some thirty million years ago, Ganges river dolphins diverged from other toothed whales, making them one of the oldest species of aquatic mammals that use echolocation, or biosonar, to navigate and find food. This also makes them ideal subjects for scientists working to understand the evolution of echolocation among toothed whales.

Fuente : http://www.eurekalert.org/pub_releases/2013-04/who…