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Cliff Swallow (Petrochelidon pyrrhonota) birds building mud nests

Cliff Swallow (Petrochelidon pyrrhonota) birds building mud nests in the banks of the bluff off Estero Bay, as seen from a docent-led walk entitled “Walking Along the Edge” by Norma Wightman, Estero Bluffs , Cayucos, CA, 01 April 2011.

Photo © 2011 “Mike” Michael L. Baird, mike {at] mikebaird d o t com, flickr.bairdphotos.com. Shooting a Canon EOS 5D Mark II 21.1MP Full Frame CMOS Digital SLR Camera with Canon EF 100-400mm f4.5-5.6L IS USM Telephoto Zoom Lens, circular polarizer, handheld with IS on, RAW. ISO 1600 used to maintain a 1/f shutter speed.

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Taken on April 1, 2011