Translation:There is a bird in the tree.
Is this saying that there is a bird only on the very top of the tree, or does it mean that a bird is perched somewhere on the tree? In English we say that there is a bird in the tree if the latter is the case. On the tree is a more marked case in my English, and would generally mean that the bird is perched at the tip-top, or that we are talking about a Christmas ornament. I guess the real issue is the Chinese and whether it only means on the very top of the tree or not.