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  1. Microtus

    Bank or Tree Swallow - Marin County, California, USA

    To me, all the birds are Tree Swallows. #3 is a young Tree Swallow; it looks like the ones begging from adults in #1 and #2. "Juveniles are brown above and white below, but some juveniles and females can show a weak, blurry gray-brown breast band."...