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A zoogeographic analysis of the South American chaco avifauna. Bulletin of the AMNH ; v. 154, article 3
.................................................................... Introduction .................................................................. Methods and Materials
Sympatry in Woodpeckers of Lowland Malayan Forest
TLDR
An analysis of the ecology and morphology of sympatric woodpeckers in Malayan forests finds remarkably uniform, arboreally specialized birds with adaptations which enable them to excavate nesting cavities in trees, climb vertical tree trunks, maintain a position suitable for "woodpecking," and peck, probe, and excavate for insect food in and under the bark of trees.
BURDENS OF THE PICID HOLE-EXCAVATING HABIT
TLDR
Von Haartman (1971) demonstrated that the population density of hole-nesting birds could be dramatically increased by providing nesting boxes where holes were uncommon or lacking in managed forests, and he showed that such birds are substantially more numerous in unmanaged forests that have holes available than in similar, but managed forests.
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