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 Calliope Hummingbird, pictured above, in our August 2016 issue.
The smallest breeding bird in North America, Calliope Hummingbird is well known throughout its breeding range, chiefly in montane forest habitats in the Sierra Nevada of California, in the Cascade Mountains of Oregon and Washington, and in the Rocky Mountains from southern Canada south to near Yellowstone National Park. Individuals vacate their breeding range entirely during the winter and are found mainly along the Pacific coast of central Mexico.
On the January map (left), purple squares in southeastern states represent individuals that overwintered at backyard hummingbird feeders, a relatively recent phenomenon. In August (right), the species can be found across much of the western United States and in parts of southwestern Canada, where it visits backyard gardens, wildflowers, and hummingbird feeders.
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 August 2016 issue of BirdWatching. Subscribe.
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