This isn't my area of expertise (assuming I have one), but geese show
variations of size and plumage that leave us all guessing. The National
Geographic Guide shows a "blue phase variant" with plenty of white on
the belly, though with only a bit of dark on the neck. Is it close in
appearance to your birds?
I would assume Ross's x Blue hybrids would be smaller than a typical
Blue - but who knows?
Terry Wright wrote:
> Quoting from Sibley's:
> "The combination of dark neck and white belly is not shown by snow
> goose." (The Sibley Guide to the Birds, first edition, Chanticlear
> press, 2000, p78.)
> Either I am misinterpreting this quote or someone forgot to tell the
> snow geese this 'fact', or maybe new color morphs have arisen since
> publication??? Today at the DCWMA we observed at least 5 individual
> blue-phase snow geese with white bellies. Could these be Snow x
> Ross' hybrids? They certainly were NOT Ross's Goose! I can send
> pictures to anyone interested in this topic.
> Discussion on this observation most welcome!