It's interesting that given the collective problem solving skills of ants, that they are apparently unable to figure out not to fall into a hole.<p>I wonder if they just fall through by random chance, or if there was some ant at some point that left a "hey guys, there's food down here" pheromone trail, and all the ants that came after just reinforced it into an ant super-highway. If no one ever comes back to say "actually, there isn't any food down there, just an inescapable pit", then I guess ant logic says there must still be something good down there.