Cooper's Hawk
Accipiter
cooperii
Uncommon but increasing in forested habitats at low and middle elevations throughout four-county area; probably under-recorded due to secretive, non-aggressive nature at nest sites. Less common at high elevations, particularly in King County—possibly resulting from paucity of large hardwood trees for nesting (Smith et al. 1997). Increased frequency of nesting in wooded tracts within westside urban core beyond close of atlas period perhaps indicative of ability to adapt to human-altered habitats.
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