What is the likely reason a Yellow-bellied Sapsucker drills holes primarily on trunks or large branches?
Answer
They are likely seeking wood with greater vascular activity and better sap volume.
The location chosen for sap drilling is often dictated by the physiological need for a consistent and abundant supply of sugary liquid. Sapsuckers tend to target established trunks or substantial, mature branches rather than small, new twigs. This preference strongly suggests they are targeting areas where the tree's vascular system is most robust and active. Wood in these larger structures can support a greater flow rate and higher volume of sap compared to newer, thinner growth, thereby maximizing the energy return on the bird's investment in drilling and maintenance.
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