in number.Human beings are born with this ability.__2__，experiments show that many animals are，too.For example，many birds have good number sense.If a nest has four eggs and you remove one，the bird will not

　　__3__.However，if you remove two，the bird

　　__4__ leaves.This means that the bird knows the __5__ between two and three.

　　Another interesting experiment showed a bird's

　　__6__ number sense.A man was trying to take

　　a photo of a crow(乌鸦)that had a nest in a tower，but the crow always left when she saw him coming.The bird did not __7__ until the man left the tower.The man had an

　　__8__.He took another man with him to the tower.One man left and the other stayed，but they did not

　　__9__ the bird.The crow stayed away until the second man left，too.The experiment was

　　__10__

　　with three men and then with four men.But the crow did not return to the nest until all the men were

　　__11__.It was not until five men went into the tower and only four left that they were __12__ able to fool the crow.

　　How good is a human's number sense? It's not very good.For example，babies about fourteen months old almost always notice if something is taken away from a __13__ group.But when the number goes beyond three or four，the children are

　　__14__ fooled.

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