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 Cerulean Warbler, pictured above, in our June 2016 issue.
The maps above compare distributions of Cerulean Warbler in January and May using eBird data from the last 10 years. Most Ceruleans winter in the Andes, from Venezuela and Colombia south through Ecuador and Peru.
During the breeding season, the warbler prefers mature deciduous forests, from low-elevation riparian bottomlands to ridge tops in the Appalachian Mountains. Its breeding range extends from central Minnesota and northern Wisconsin south through Missouri and Arkansas and east along the Appalachians from Tennessee north to southern New York.
Up to 70 percent of the population is thought to breed in the Appalachians. Purple squares on the May map fall primarily in these areas, although late-migrating individuals (light purple squares), show up along the Gulf Coast from Texas to Florida and in parts of Central America. The species is very rare in western North America year-round.
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 2016 issue of BirdWatching.
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