Ants that walk on each other to get over holes

Came across an AFP article today (ok, a month or so ago, but apparently I didn\’t hit the Publish button after writing this post) about army ants using their bodies to cover holes, so other ants can walk across on the backs of the first ants. This isn\’t a bunch of ants being sacrificed to physically fill holes; instead, the ants stretch across the holes to let others cross on them, then they carry on their way. According to a study to be published in June, this behavior makes for significantly more efficient foraging parties.