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In On the Move, our regular column about migration, we present pairs of distribution maps from eBird that you can use to compare where interesting birds are at different times of year. We featured Cape May Warbler, pictured above, in our June 2017 issue.
Cape May Warbler
Cape May Warbler breeds in boreal coniferous forests across Canada, from Alberta east to Quebec and in portions of the northern lower 48, from Minnesota to Maine. A spruce budworm specialist, the warbler’s population fluctuations are correlated with the boom and bust of the spruce budworm, a naturally occurring insect that causes periodic widespread defoliation of spruces and firs. In June, warblers occur across much of southern Canada in the boreal forest zone, and in January, the birds winter almost entirely in the Caribbean. Important wintering sites include Jamaica, Hispaniola, Puerto Rico, and Cuba. Look for migrants in patches of conifers, though they will use other forested habitats.
eBird is the real-time online checklist operated by the Cornell Lab of Ornithology and Audubon. “On the Move” is written by eBird’s Garrett MacDonald, Chris Wood, Marshall Iliff, and Brian Sullivan. Submit your bird sightings at ebird.org.
A version of this article appeared in “Birding Briefs” in the June 2017 issue of BirdWatching.
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