Yellow-bellied Sapsucker

I could hear this bird tapping on trees long before I could see it. Most of their foraging time is spent creating, maintaining, and feeding from sap wells. Sap itself makes up only about 20% of their overall diet, though at certain times, the figure can be nearly 100%. During early spring, the xylem tissues have high sugar content (to fuel leaf growth), and so sapsuckers drill through the phloem to make xylem wells, which are round holes. The remainder of their diet consists of insects, fruit, and seeds.