[NatureNS] gull ID

Date: Fri, 30 Jul 2010 10:28:06 -0300
From: Sydney Penner <sfp@sydneypenner.ca>
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Hi all,

I dropped in at Cherry Hill today and found a gull that puzzles me. The 
puzzlement may just have been created by limited visibility (there was 
wind, rain, and mist) and by confusion on my part. Still, I'm wondering 
if someone might be willing to look at a few pictures (of rather low 
quality) and let me know what they think.

Here are two pictures that allow for a size comparison with a Herring 
Gull at about the same distance:
http://picasaweb.google.com/sepenner2/CherryHillGull#5499491907295283410
http://picasaweb.google.com/sepenner2/CherryHillGull#5499491902228246114

Here are two pictures from a bit closer:
http://picasaweb.google.com/sepenner2/CherryHillGull#5499491912860227154
http://picasaweb.google.com/sepenner2/CherryHillGull#5499491906756103170

Some salient points:

1) The gull was quite a lot smaller than the numerous Herring Gulls in 
the area. I know that there is some variation in Herring Gull sizes, but 
this gull struck me as too small to be a Herring Gull. But maybe there 
is even more variation than I think.

2) My next thought was that it was a Ring-billed Gull. But Ring-billed 
Gulls were the common gull in New York where I lived for the last five 
years, and I convinced myself that this bird just didn't quite look 
right to be a Ring-billed Gull. That said, I definitely still think that 
Ring-billed is a possibility.

3) One reason I doubted Ring-billed is the head shape: it looks more 
rounded to me than what I would have expected. But here it would have 
been really handy to have a few Ring-billed Gulls sitting around for 
comparison purposes.

4) I kept trying to figure out what the colour of its legs was, but the 
low visibility left me unsure. Generally, the legs didn't look yellow to 
me, but one could definitely imagine yellow legs with the last of the 
photos linked to above.

5) The eyes consistently looked dark to me, but, given the visibility, 
I'm not sure how much I would stake on that.

6) One additional piece of information not evident from the photos: the 
upper side of the tail was entirely white.

A couple of the features I mentioned (head shape, eye colour) might 
suggest Mew Gull. But (a) Mew Gull doesn't seem very likely around here 
and (b) not all its features match Mew Gull well (e.g., I would have 
expected more obvious white crescents on its wings if it were a Mew 
Gull). I also don't have any experience with Mew Gulls, making such a 
judgement trickier.

Anyway, if someone can tell me more about this gull, I would be grateful.

Best wishes,
Sydney


Sydney Penner
114 Willow Ave.
Berwick, N.S. B0P 1E0
sfp@cornell.edu

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