White-throated, White-crowned and Song Sparrows continue to give feeble renditions of their songs-as do Ruby-crowned Kinglets. I think this is more adults experiencing similar daylight hours to early spring, aka reproductive (or testicular), recrudecence, as opposed to juveniles ‘practicing’ their vocals? In late September I even had a Song Sparrow briefly repeat his early spring attempts to attack the rival he saw in reflection on my office window! But not with the same vigor.
Observer: Sean Smith