Phil, 

Thank you for posting the pictures and notes on field marks.

But, one thing is confusing me.  All of the geese in your pictures seem to have about the same body shape and posture.   In contrast, the picture of a Graylag Goose on page 61 of Sibley's showes it to be shaped more like a domestc white goose, with an obviously deeper body compared to its length.  Sibley's even makes note of the "deep belly" as a field mark.  Sibley's also showes a thin white strip between the bill and head, much like the White-fronted, but substantially thinner.  Since Sibley's also says that Graylag individuals may have a lot of additional white on them in various places, I have been mainly depending on the body shape, rather than looking at the more subtle marks such as the white body line or the thickness of the white "front."  I am pretty sure that I have seen both, before, and was confident of my ability to tell the difference until I looked at your illustrations.

Can you tell us any more about the body shapes?

Steve

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