The small black ants that we see running back and forth in the grass are the same ants that annoy us by coming to our picnics uninvited. They are not trying to make pests of themselves, but are only doing the house-keeping job they were made for. They are nature's clean-up crew One of these ants, scouting in the grass, finds the trail of an injured beetle. In some mysterious way the news spreads. Soon there are two ants, then a few more. Then a dozen or more are running around the beetle. Enough ants will come to put a end to it When the beetle is dead, the ants carry it away to their underground burrows. The efficient ants leave nothing in the grass but the empty shell.