Millions of years before humans invented sonar, bats and toothed whales had mastered the biological version of the same trick – echolocation. By timing the echoes of their calls, one group effortlessly flies through the darkest of skies and the other swims through the murkiest of waters. It’s amazing enough that two such different groups of mammals should have evolved the same trick but that similarity isn’t just skin deep.

via ‘Echolocation in bats and whales based on same changes to same gene’ by Ed Yong – Not Exactly Rocket Science – RichardDawkins.net.

this is exciting and amazing stuff.  Whales and bats share the same genetic make up for echolocation?  who knew this?