Description
在茶棚公园观鸟时发现，北京的三种啄木鸟分别占据了一棵树不同的生态位，星头啄木鸟在树的上三分之一的地域内取食，大斑啄木鸟占据树的中三分之一，而灰头绿啄木鸟占据树的下三分之一。这种自然食域分类可以有效的避免不同种类之间的无谓竞争，使其各安其位。
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