I agree that your description sounds more like a juvenile, but I wanted to speak to the questions around hybridization involving Greater White-fronted Geese. There are several species that GWFG hybridize with, the most common (though rare) we would find in Colorado are hybrids with Cackling or Canada. Typically I rely on using the eBird media search when researching hybrids, as the regular ebird Explore Species search will not take you to the species pages for hybrids. As you can see in the screenshot below, there are several crosses in the drop down menu.
Interestingly more than half of the confirmed ebird records for Greater White-fronted x Cackling Goose are from Colorado -- 179 out of 362. There was one reported at Dodd Reservoir not quite a week ago by Thomas Heinreich (in this checklist), in which that bird almost has a white cheek, but where white would be is just smudgy brown/dark gray. There are slightly fewer confirmed ebird records in Colorado for Greater White-fronted x Canada Goose -- 145 out of 952 (world wide).
The other 2 GWFG hybrids we would potentially find in Colorado would be Snow x GWFG and Ross's x GWFG. However, there are only a dozen Snow x GWFG ebird reports in Colorado. There are only 2 total Ross's x GWFG records in eBird, one of which is in Colorado. Note these are observation counts and not necessarily individuals -- these are the truly rare birds!
In fact one of the coolest birds I've observed was a Snow x GWFG I observed in Southern Indiana. Check out the photos of it in this checklist:
Also, here is a checklist from when I observed a GWFG x Cackling Goose in Weld County:
Also, here are a couple of good resources I've found on hybrids:
Bird Hybrids Blog - Note it hasn't been updated in a few years, but has good write ups on most hybrids.
Thanks,
Jeff Percell
Erie, CO
On Tue, Dec 10, 2024 at 12:35 PM Elena Holly Klaver <elena@indra.com> wrote:
Eric DeFonso suggested a juvenile, and that makes the most sense. There was an adult at Dodd a few weeks ago, very clearly, and since I haven't seen many juvenile GWFG, it's likely my lack of experience with them.--Elena Holly Klaver
United States Court Certified Interpreter
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I acknowledge that I live in the territory of Hinóno'éí (Arapaho) and Cheyenne nations, according to the 1851 Treaty of Fort Laramie, and that Colorado's Front Range is home to the Ute and many other Native peoples. Reconozco que vivo en el territorio de las naciones Hinóno'éí (Arapaho) y Cheyenne, según el Tratado de Fort Laramie en 1851, y que el estado de Colorado al este de las Montañas Rocosas es territorio de los Utes y muchos otros pueblos indígenas.On Dec 10, 2024, at 11:13 AM, elena <elena@indra.com> wrote:There's an odd looking greater white fronted goose, maybe a hybrid? S/he has the orange bill and orange (a little more faded than a usual GWFG) legs, white under tail, body color similar to GWFG, but no white on face and the goose just looks a little, well, different. Visible from 75th street, I have a phone camera picture. Do they hybridize with anyone else? Dodd Reservoir is between Monarch and Niwot roads and 75th street just off the Diagonal.
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Elena Holly Klaver
Federally Certified Court Interpreter
Conference Interpreter
English <> Spanish
303 475 5189
Member: American Translators Association
Colorado Translators Association
Pronouns: she, her, hers
I acknowledge that I live in the territory of Hinóno'éí (Arapaho), Cheyenne and Ute Nations, according to the 1851 Treaty of Fort Laramie, and that Colorado's Front Range is home to many Native peoples. Reconozco que vivo en el territorio de las naciones Hinóno'éí (Arapaho), Cheyenne y Ute, según el Tratado de Fort Laramie en 1851, y que el estado de Colorado al esté de las Montañas Rocosas es territorio de muchos pueblos indígenas.
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