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Notes on controlling bark beetles:

The northern three-toed woodpecker is a year-round resident of western forests and a keystone species of higher elevation forests. They are important primary cavity excavators, providing homes for a multitude of other species. They contribute to the regulation of beetle populations by maintaining beetles at endemic levels, delaying beetle outbreaks, as well as by accelerating population decline. During winter, these woodpeckers switch to secondary insects. From: Ecological Interrelationships of Three-Toed Woodpeckers with Bark Beetles and Pine Trees by Chris Steeger and Jakob Dulisse, BC Forest Service.

Image from Naumann, Naturgeschichte der Vögel Mitteleuropas (Natural history of the birds of central Europe), 1905.