Date: 6/13/18 5:05 am From: Chris Rimmer <crimmer...> Subject: [VTBIRD] Surprises on Mansfield
VCE's third field visit to Mt. Mansfield on Tues-Wed yielded some surprises among the 61 birds we captured in our 23 mist nets. Weather was favorable, though breeze a bit strong from the SW on Wednesday morning, when activity subsided rapidly after ~9:00 am.
Far and away, the most unexpected capture was a Philadelphia Vireo, the first we have encountered on Mansfield in 27 years of banding. The bird showed no signs of breeding and might be a very late migrant, or just a non-breeding wanderer. Very exciting for all to see. As has become increasingly the norm, but more often later in the season than this early, we captured several species characteristic of northern hardwoods forests. We suspect that many or most of these are failed or non-breeders.
The capture of a juvenile White-winged Crossbill with incompletely-grown flight feathers was another notable surprise, and strongly suggests that the bird was locally hatched. That helps explain our capture of the same adult pair in the two previous successive weeks. This was, however, our only encounter with crossbills on the ridgeline. A few small flocks of siskins were still present, and we captured 3.
Bicknell's Thrush continue to make a good showing, and we have now captured 30 individuals so far this season. Still not a single red squirrel has been encountered on the mountain, though I was on Okemo Mountain this past Sunday and ran into half a dozen up there. It looks like a very light fir cone crop emerging this year.
Our 2-day list of mist-netted birds:
Least Flycatcher 1 Philadelphia Vireo 1 Carefully examined in hand and photographed; conspicuous yellowish underparts, small size. Photos to follow. First banding record on Mansfield in 27 years. Brown Creeper 1 female with beginning brood patch; failed breeder(?) Ruby-crowned Kinglet 1 male Bicknell's Thrush 14 6 new, 3 returns (birds from 2015, 2016 and 2017), 5 within-season recaptures Swainson's Thrush 3 1 return from 2016, 2 from 2017 American Robin 4 new bandings (1 male, 3 females with full incubation/brood patches) Black-and-white Warbler 1 male Blackpoll Warbler 11 3 new, 5 returns (2 from 2016, 3 from 2017), 3 within-season recaptures Yellow-rumped Warbler (Myrtle) 6 3 new, 1 return from 2016, 2 within-season retraps; 2 females with fully-developed incubation patches Black-throated Green Warbler 1 female with regressing brood patch; probably a failed breeder Dark-eyed Junco (Slate-colored) 3 White-throated Sparrow 8 6 new, 2 within-season recaptures Purple Finch 2 White-winged Crossbill 1 locally-hatched juvenile with stubby tail and wings (~2/3 grown) Pine Siskin 3 2 juveniles, 1 adult female
We''ll be back up there next week on Tuesday-Wed.
Chris Rimmer Vermont Center for Ecostudies PO Box 420 | Norwich, Vermont 05055 802.649.1431 x202 http://vtecostudies.org/