Woodpeckers are known for their conspicuously loud pecking of trees,which is a necessary foraging behavior.Unlike many other birds,nearly all woodpeckers use the same foraging technique of pecking into the trunk of a tree to acquire food (often insects that inhabit the tree).Although woodpeckers use the same foraging technique,certain species prefer to forage at different heights in the same species of tree based on the size of the woodpecker species.Which of the following ecological terms best describes this practice?