Sapsuckers drill small holes in the bark of favored trees, then return again and again to eat the sap that flows out. And hummingbirds, kinglets, and warblers come to the sap wells to eat the insects trapped in the sap. Although a sapsucker (like this Red-breasted Sapsucker) may suck a tree's blood, so to speak, the drilling usually doesn't damage an otherwise healthy tree.

More info and transcript at BirdNote.org.

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