Biologists have uncovered the genetic secrets of the world's smallest diving mammals - water shrews.
Using DNA samples to construct an evolutionary tree, scientists revealed that diving behaviour evolved five distinct times in this group of insect-eating mammals.
To track this surprising evolutionary journey, the scientists collected DNA samples from 71 different species all belonging to a large group of related, insect-eating mammals, collectively called Eulipotyphla.
That Greek term translates to "the truly fat and blind"; it is a group of mammals that includes hedgehogs, moles and shrews.
He added that the genetic study had provided fascinating insight into the evolution of mammals that appear to be "the least equipped for diving".
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