[NatureNS] The strange goose at Belleisle - not hybrid Snow X Canada

Date: Mon, 05 Apr 2010 10:02:09 -0300
From: iamclar@DAL.CA
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All:

There have been a couple of reports of a purported Snow X Canada Goose
hybrid at the Bellisle Marsh. On 26 March, Kevin Lantz forwarded good
photos of this goose to me and Eric Mills. We both concluded that is
was largely or entirely a derivative of a domestic strain of Graylag
Goose, possibly but not certainly with a touch of Canada Goose. Here's
what I wrote to Kevin

"The marked wavy lines on the long neck mark it as an Anser Goose - at
least partly. And the heavy pink bill and very long neck mark it as
some kind of extraction of Greylag Goose. Domesticated versions of
these can be white, of course, and often have the deep bellies shown
by this one. There have been reports a number of free-flying
individuals of these in the Valley and elsewhere in recent years. It
may be wild and associating with our resident Canadas, and maybe even
a hybrid (or more likely backcross) with a Canada. The pattern of some
of the "normal" feathering - e.g. pale underwing coverts vs largely
black flight feathers (with some white ones from domestic selection or
partial amelanism - oops, somewhat pigmentally challenged) - seems to
conform to Graylag, but the darker rump does not, and maybe that's a
touch of Canada.

That's about all that might be said, I guess."

Cheers, Ian

Ian McLaren





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