Nocturnal migration, Oct. 3rd, Boulder County

[Ted Floyd]

Hello, Birders.

At Greenlee Preserve, Boulder County, during the 5am hour this morning, Thursday, Oct. 3rd, I heard and audio-recorded a light but steady passage of calling White-crowned Sparrows. If you're interested, their flight calls look like this: http://tinyurl.com/WCSp-Greenlee

After sunrise, I heard and saw a few Barn Swallows; cf. Leatherman's earlier ponderings.

Ted Floyd

Lafayette, Boulder County, Colorado

[DAVID A LEATHERMAN]

Ted et al,
OK, I have another pondering.  The summer resident Chimney Swifts that nest in several of the brick chimneys in Old Town (i.e., downtown) Fort Collins appear to leave every year in either late July or early August.  During my walk down there last night on 2October at 6:45 to enjoy microbrew and jazz, at least 5 Chimney Swifts chattered overhead.  In year's past I have noticed this same pattern: local swifts in summer, no swifts for 6 weeks or so, then more swifts.  Am I correct in assuming the second wave is just migrants from somewhere n, w, or e of here?  Are we sure they are all Chimney Swifts and that there are no Vauxs mixed in?

Dave Leatherman
Fort Collins

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From: tedfl...@hotmail.com
To: cob...@googlegroups.com
Subject: [cobirds] Nocturnal migration, Oct. 3rd, Boulder County
Date: Thu, 3 Oct 2013 10:03:13 -0700

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