Abstract
During one spring to summer study in a Canadian boreal forest, Black-backed Woodpeckers (Picoides arcticus) were found to excavate mainly on logs and at the base of large-diameter tree trunks. In contrast, Three-toed Woodpeckers (Picoides tridactylus) preferred higher strata and smaller diameter trunks. The predominant foraging technique used by Three-toed Woodpeckers was bark scaling. Canadian Three-toed Woodpeckers showed foraging behavior similar to that found in European woodpeckers, but in the Nearctic range they have not fully developed the sap-licking behavior that is typical of the Three-toed Woodpeckers of the western Palearctic range.
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