ONE of the first mammals to use echolocation may not have been a bat or a whale, but an early ancestor of horses.
was a weasel-like ungulate that lived 55 million years ago, around the time that bats evolved echolocation.
of Montpellier University, France, and colleagues say that a new fossil cast of its braincase shows Hyopsodus had a large , a brain region enlarged in echolocating animals (PLoS One, ).
They argue that Hyopsodus could echolocate, but at Duke University in Durham, North Carolina, says the large inferior…
