Have you ever spotted the yellow-bellied sapsucker? If not then you may have noticed a clue left behind by it. This bird makes rows of holes into the sides of trees and slurps up the high energy sap. In addition to sap, Sphyrapicus varius has a diet consisting of insects, fruits, and buds. The yellow-bellies sapsucker is considered a keystone species as its holes attract and feed a variety of bird and insect species. See if you can find this bird on your next hike!