[NatureNS] Cooper's hawk in Dec. - 2 pictures

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Date: Fri, 5 Jan 2007 23:41:21 -0400
From: "Richard Stern" <sternrichard@gmail.com>
To: NS-RBA <NS-RBA@yahoogroups.com>
Cc: NatureNS <naturens@chebucto.ns.ca>
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On Dec. 11 I was about to turn into my driveway when I saw a smallish
hawk sitting on a branch of a tree across the road. The shape looked
like an Accipiter, but it looked big for a Sharpie. The tail also
looked relatively long for a Sharpie. I was able to take 2 quick shots
from my car before it flew behind the car into another tree in my
yard, and then disappeared. At the time I thought it might be a
Cooper's, but rather dismissed it because they are rare, and I believe
unrecorded in King's Co. or the Valley.

I posted the pics on a web site for bird photographers labeled as a
Sharpie, but several people from Ontario and elsewhere looked at the
images and felt they were classic for a Cooper's. I also sent them to
an expert who has banded and handled many birds of both species, and
he agreed.

The 2 images are at - http://www.pbase.com/rb_stern/coopers_hawk .

Points in favor of Cooper's as against Sharpie --

-The general lanky, long "jizz", and at the time of the initial
observation, the size of the bird.
-The fine, tear-drop- shaped streaks on a white background on the
breast and extending onto the belly (Sharpies tend to have less
well-defined and coarser streaks).
-The outer retrices are shorter than the next inner ones, although
there appears to be some wear in the tips of the central ones giving
the tail at least a partially squared off look.
-The eye is straw-colored as against bright yellow.
- The supercilium is relatively narrow.

Note that all of these characteristics could possibly occur in a large
F. Sharpie, but it would be highly unlikely for all to occur together
in the same bird, and the breast pattern and outer retrices in
particular are pretty diagnostic.I personally feel that the thickness
of the legs is too subjective to comment, but others are OK for
Cooper's..

I have not seen the bird since.

If anyone feels that it is actually a highly unusual Sharpie (or
anything else) please feel free to comment.

I get the impression that compared to, say, 20 years ago, more
Cooper's are being seen, described and now photographed in NS. I
wonder if birders are getting better at distinguishing them from the
far more common Sharpie, or are they really increasing here?

Richard

-- 
#################
Richard Stern,
317 Middle Dyke Rd.,
RR#1 Port Williams,
NS, Canada B0P 1T0

rbstern@ns.sympatico.ca
rbstern@xcountry.tv
sternrichard@gmail.com
###################

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