Blue-grey gnatcatcher, Polioptila caerulea, photographed at Phoenix, Arizona, USA.
Image: Pete Moulton [velociraptorize].
This is a blue-grey gnatcatcher, Polioptila caerulea. This is the northernmost occurring gnatcatcher species, and the only one that is truly migratory. This species is expanding its range northward throughout the eastern portions of North America.
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