This report from Tom Carrolan ([log in to unmask]):
For Sunday, December 22, 2002 -- A raptor survey of Bridport, Addison,
and Panton, mostly west of Rt. 22A.
Weather: partly cloudy with temps into the mid-40's, windy out of the SW.
There has been a notable shift in the Roughlegs observed since
Thanksgiving! While the Roughleg number was just about the same, there
has been a significant increase in the adult males and a diminishing of
immatures and females. Redtails increased and are predominately adult
males. The immature and adult female line has shifted south. It appears
there were very few juveniles produced last summer -- by the most
northerly nesting Redtails and the Roughlegs. The food up there is
apparently at such a low enough point that adult males who we would
rarely see, as they stay close to their summer territories, have come for
a visit. The fine number of raptors in the Addison area -- especially
just south of Rt. 125 -- is a result of the abundance of voles peaking in
that area. I even observed crows standing around with voles in their beaks.
Something interesting to for watch for... if the area now has a
signifcant snow pack [10+ inches], then that should cause the snow-
intolerant Northern Harriers to move south. Bare areas [or nearly so]
created by drifting will allow them to stay around, but too much snow and
NINETY Raptors in all!
33 Red-tailed Hawks [all adults; primarily males] + 4 more adults just
south of the count area
38 Rough-legged Hawks [26 light; 11 dark; 1 undetermined] [23 adult; 8
immature; 6 undetermined] + 2 more just south
8 Northern Harriers [5 adult males; 1 adult female; 2 immatures]
3 American Kestrels [3 adult males]
1 Cooper's Hawk [immature male]
1 Bald Eagle [adult] at the Crown Pt. Champlain Bridge
One more survey to go... around Groundhog Day.
Hawk Food: Horned Larks have moved on [groups 6-12 individuals/ maybe 10
such groups]; 1 Northern Flicker. I didn't see any Snow Geese.