Penguins typically look pretty dumb as they waddle around on snow. But now a bunch of researchers has realised that, actually, they move an awful lot like cars in traffic.

See, when one penguin in a huddle takes a step, it triggers a wave of coordinated motion through the group, New Scientist explains. The result is motion similar to the way cars inch forward in a traffic jam. This video shows how it works. [New Scientist]