Ed I've experienced this too with White-crowned Sparrows. Last year there was one in our neighborhood that sang, sporadically, well after dark. I looked forward to it on the nights I was slaving away at the computer. I would generally only here it once or twice if I listened between 10-11pm. It was always a pretty hardy song.

Ted Ryan
Fredrickson, WA

On May 2, 2011, at 12:03 PM, "Ed Swan" <edswan at centurytel.net> wrote:

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> I spent the weekend with my son?s Boy Scout troop at Ft. Worden by Port Townsend this weekend. Both nights, I heard a number of White-crowned Sparrows singing in several different locations as late as 11pm. They often seemed to be set off by some human-caused noise.
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> I heard my tanager of the season there yesterday and saw a Turkey Vulture come up from the Pt. Wilson area.
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> Ed
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> Ed Swan
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