These are baby bats — embryos actually. They remind me of those See No Evil, Say No Evil, Hear No Evil monkey pictures I saw growing up, but these little guys are much, much cuter. And, of course, being bats, the hearing thing doesn't apply. Bats don't hear with our kind of ears, so of course, there's no covering-ears-up picture. That wouldn't make bat sense.
This photograph was taken by Dorit Hockman of Cambridge University. It's the 20th place winner in the Nikon Small World 2012 Photomicrography Competition.