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Detalles de la observación
Possibly this ssp; main reference: https://www.sibleyguides.com/2022/05/subspecies-of-common-grackle-bronzed-florida-and-purple/ and comparing images in the Macaulay Library. A clear demarcation between bluish-purple head and bronzed body with very limited muted purple on wings, slightly larger and heftier than the apparently "Purple" COGRs they were associating with. According to Sibley, "Bronzed" COGRs are known to come down from the north in winter. "Purple" is the expected "subspecies," but even that represents a broad range of intergrades. Nevertheless, I believe these birds fit the "Bronzed" ssp. well enough, especially as Sibley, citing Chapman, said that "Bronzed is an irregular and scarce winter visitor, appearing mainly when heavy snow cover or extreme cold forces wintering flocks to move." The past evening's snowstorm and cold snap fit exactly that description. Probably much more common in winter than reported because they are commonly overlooked or dismissed as "Purple" or simply the main species. Even after looking at my own "Purple" COGR photos, several of them could pass as a "Bronzed." Additional feedback greatly appreciated.
Información técnica
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