As you study two closely-related bird species, the yellow and orange warblers, you notice that each species seeks many different types insect prey (midges, caterpillars, beetles, leafhoppers, and wasps) in areas without the other species. However, where their ranges overlap, the yellow warbler mostly eats caterpillars, midges and leafhoppers and the orange warbler mostly eats beetles and wasps, as well as some spiders. You have discovered an example of .