MacGillivray's WarblerGeothlypis tolmiei
4 3/4-5 1/2" (12-14 cm). Slate gray hood extending to upper breast, where it darkens to black. Olive green above, yellow below; female slightly paler. Both sexes have broken white eye ring. In fall, hood lighter, broken eye ring less distinct.
Song a chanting tree tree tree tree sweet sweet! Call a loud tik, sharper than the calls of most other western warblers.
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Coniferous forest edges, burns, brushy cuts, or second-growth alder thickets and streamside growth.
Breeds from Alaska and Yukon south to California and central New Mexico. Winters in tropics.
MacGillivray's is a common western warbler. Two similarly hooded warblers occur east of the Rockies, the Connecticut Warbler and the Mourning Warbler. No doubt these all originated from a common "hooded warbler" forebear during the vicissitudes of the past Ice Age, when during warm interglacial periods the forests expanded, only to be split again when the cold grip of the glaciers returned.
3-5 white eggs, with brown spotting, in a grassy cup nest close to the ground in a bush or tall weeds.