There were seven birds on the tree, and a man shot one. How many birds were there on the tree?

If the killed bird hangs on the tree and does not fall off, then there is only one bird left; if it falls off, there is no one left.

If the following conditions are met:

1. The sound of the gunshot will cause ear pain

2. The bird was really killed

3. Are any of the birds in the tree deaf?

4. None of them are in cages

5. There are no other trees nearby and no other birds on the trees

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6. There is no bird that is disabled or too hungry to fly

7. It does not count the bird in the pregnant belly

8. The person who shoots the bird has no eyes Flowers, guaranteed to be seven

9. There is no stupid bird that is not afraid of death

10. It will not kill two with one shot

11. All All the birds can move freely

Then it can be concluded that if the killed bird hangs on the tree and does not fall off, then there is only one bird left; if it falls off, there is no one left.

Extended information:

This question comes from a joke:

A: "I would like to ask you a question: There are 7 birds on the tree. The hunter killed them. 1. Count, how many are there in the tree?"

B: "There are 6 more birds."

A: "Wrong, 1 bird. There are no more children."

B: "Why not?"

A: "The rest are all gone."

B: "That's it. Yes, I understand.”

A: “Please continue the calculation: there are 7 birds on the ground, and one bird was killed by a hunter. How many birds are there on the ground?”

B: "I see, there is one bird on the ground.

A: "Wrong again, there must be two. ”

B: “Why are there two birds?” ”

A: “I just killed one bird from the tree and fell down. Didn’t it mean it became two birds?” ”