When I was doing winter raptor surveys there over a period of several years I think there was often some north/south movement throughout the season depending upon snow cover. I usually conducted the first of four visits Thanksgiving weekend, with the others at ~4-week intervals. Even in December I would occasionally see a high-flying southbound bird, but often would note one or two birds hanging out at a place where I would see a pair again in January. By January pairs would be a common sight. Were these “truly wintering” or possibly year-rounders? Only tagging could say for certain.
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"the fate of all conservationists [who] fall in love with the earth [is] to die broken hearted.”
> On Oct 21, 2020, at 12:10 PM, david merker <[log in to unmask]> wrote:
> Hey all you Champlain valley birders. I'm wondering what you all would suggest is an approximate date when the redtails one sees in the valley are truly wintering birds? thanks
> David Merker
> Etna, New Hampshire
> Cape May Raptor Banding Project Inc.