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Hurray or another (elusive) geolocator.  Hope to hear what they will have told you about BITH movements.

Ruth Stewart

E. Dorset, VT

 > Date: Thu, 14 Jul 2011 11:13:53 -0400
> From: [log in to unmask]
> Subject: [VTBIRD] Mansfield wrap-up
> To: [log in to unmask]
> 
> VCE's final summer field session on Mt. Mansfield Tuesday evening 
> started on a rough note, as a torrential downpour caught us off-guard 
> while we were out setting mist nets.  However, we gradually dried out 
> with the steadily improving weather, and yesterday morning was 
> productive.  Most montane forest nests have clearly hatched, if not 
> fledged, and vocal activity of all species was more pronounced than 
> during the previous 2-3 weeks.  We mist-netted or observed fledglings of 
> Blackpoll and Yellow-rumped warbler, Dark-eyed Junco, White-throated 
> Sparrow, and American Robin.  We were surprised to capture 4 juvenile 
> and apparently independent Hermit Thrushes, which do not breed on the 
> ridgeline.  Other mist net captures included 11 Bicknell's Thrushes -- 4 
> unbanded males, 6 birds that we had already captured earlier in the 
> season, and one 6 year-old male with a solar geolocator that had managed 
> to elude us all summer.
> 
> In addition to free-flying juveniles, signs that the avian nesting 
> season is waning included several females of different species with 
> regressing brood/incubation patches, and a number of adult birds in the 
> early stages of flight feather molt.  Most migrant songbirds fit their 
> annual molt (an energy-intensive undertaking) between the end of 
> breeding and departure for fall migration, so finding thrushes and 
> warblers with their innermost primaries missing is a sure sign of things 
> to come.  By the end of this month, the montane forest will be a quiet 
> place, as vocalizing becomes scarce and adults lay low while in heavy molt.
> 
> We'll make a final foray to Mansfield in early to mid-September, when 
> Bicknell's Thrushes typically show a brief resurgence of activity, 
> including calling and singing, before they head south later in the month 
> or during early October.
> 
> Chris
> 
> -- 
> Chris Rimmer
> Vermont Center for Ecostudies
> P.O. Box 420
> Norwich, VT 05055
> 802-649-1431 ext. 1
> http://www.vtecostudies.org