If one flies down from the tree, there are as many on the tree as there are under the tree, which means there are more on the tree than under the tree 1×2=2 (only);

If one flies from the tree, there will be 2×2=4 (only) more on the tree than under the tree;

At this time, the tree is 1/3 of the whole flock, so the tree is 1- 1/3=2/3 of the whole flock, and the tree is 2/3- 1/3= 1/3 of the whole flock, that is, it is obtained above.

Therefore, the total is 4÷ 1/3= 12 (only).

From the problem of sum and difference:

The tree is (12+2)÷2=7 (only)

Under the tree is 12-7=5 (only)

I hope I can help you and wish you success! ! !