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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