Re: Pacific Commons Linear Park (8/8/20) - Possible Chimney Swift


Michael Park
 

Here's a guide to judging the wingshape characters mentioned by Jerry.

https://www.sibleyguides.com/2010/10/identifying-chimney-and-vauxs-swifts-by-wing-shape/

Judge for yourself. Vocalizations are distinct between Vaux's and Chimneys swifts, but are not noted in the report.

The wing's look broad, the secondaries do not seem to bulge significantly, and the primary shape appear relatively linear. The photos are very nice for seeing these characters.\

David Sibley refutes his previously published notions of relative tail lengths in the linked web page. This illusionary difference may be the result of the narrower wing in Chimney Swift.

Michael Park
Berkeley

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