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There's a place out in California (Fort Hunter Leggett) where the squirrels all live on the ground beneath huge oak trees. The annual rainfall is so low that no oak is very near another due to lack of sufficient water. In the air are "squirrel hunting hawks".
The squirrels have developed a system to safely go from oak to oak. They send out a decoy squirrel in the opposite direction, shaking his tail. When he distracts the Hawk, all the others run to the next tree where there is a large supply of acorns. The decoy quickly runs back to the original tree that has enough acorns for the one lonely squirrel until the others return.
Very interesting to watch in action. Evidently the hawk does win sometimes.
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