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I obtained sap only when my incisions were made within 0.5 cm above active sapsucker holes, and then only after sapsuckers had access to my holes for a few hours.
To test whether the use of specific trees could help explain how sapsuckers obtain free-flowing sap from their incisions, I attempted to extract sap from both used and unused trees.
Because trees may die as a result of sapsucker attack, and many animals may need sap for food, how sapsuckers choose their trees and extract sap from them has far-reaching implications for the whole forest community.
Thus, although it is clear that the trees that sapsuckers attack are less healthy than surrounding trees, without more information, firm conclusions cannot be drawn about whether sapsucker use is a cause or an effect of this phenomenon.
When nectar resources are scarce, hummingbirds will also feed on sap from holes in trees made by sapsuckers (Sphyrapicus).
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