Why are trees happy and magpies happy in the words of trees?

The reason why the tree is happy and the magpie is happy is that the tree provides a place for the magpie to live, and the magpie helps the tree to eliminate pests. The vigorous growth of the tree provides a place for magpies to rest and entertain, and becomes a paradise for birds to live happily, so the tree is very happy. Magpies are also happy to have a happy place to live. The tree and the magpie depend on each other, and the magpie is very happy to help the tree catch insects and kill pests.