小黑蟻―大自然的清道夫
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The Small Black Ants，Nature's Clean―up Crew
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 them－selves，but are only doing the housekeeping job they were made for．They are nature's clean－upcrew．
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 an 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．
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