Now listen to part of a lecture in a biology class. Here's a good exampleof this. Recently, a team of researchers was observing a certain type ofsquirrel, eastern gray squirrels, gathering nuts for the winter. Of course,gray squirrels try to gather enough nuts so that they'll have food to eat allwinter long. They dig holes in the ground and bury the egg horns there. Buthere's what's interesting. The gray squirrels don't always put nuts in all ofthe holes they dig. If there's another animal nearby that might want to eat thenuts, say, a bird like a blue Jay, the squirrel might take a whole bunch ofholes, but instead of putting nuts in all of them, the squirrel will just dropa twig or a stone in most of the holes.
Only put nuts in a few, even though there aren't any nuts in some of theholes, the squirrel will still go through the same process of covering theseholes up with leaves and dirt. They actually had nuts in them. Then a blue Jaymight find these holes and start digging in them. But since most of the holesonly have a twig or a stone inside, the blue, Jay wouldn't find a lot of nuts.So after a while, it lose interest and give up looking.
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