On Sun, Nov 30, 2025 at 9:34 AM David Suddjian <dsuddjian...> wrote:
> Intergeneric hybrids are not unheard of, and in the waterfowl family the
> genetic relationships are closer than they might appear based on
> phenotype. There are quite a few known hybrid combos among geese and ducks
> that cross generic boundaries. We see it in warblers and sparrows, too, and
> other groups.
>
> By way of a waterfowl example, the Birds of the World account for Mallard
> lists hybrids between Mallards (genus *Anas*) and members of 8 other
> genera!
> https://birdsoftheworld.org/bow/species/mallar3/cur/systematics#hybrid > (a subscription is needed to view the account).
>
> David Suddjian
> Littleton, CO
>
> On Sun, Nov 30, 2025 at 8:58 AM David Hyde <davidhyde1951...>
> wrote:
>
>> This does look like the same hybrid goose. I have a question: if two
>> species hybridize that means (does it not?) that they are close to each
>> other on the species list. So how come we have a *branta* hybridizing
>> with an *anser*?
>>
>> On Fri, Nov 28, 2025 at 8:37 PM Gary Bowen (Thornton) <
>> <gewb10026...> wrote:
>>
>>> Might it be this bird from early this morning at McIntosh Lake?
>>>
>>> Regards,
>>> Gary Bowen
>>> Thornton, CO
>>>
>>> [image: IMG_6369-Edit-Edit_LuminarNeo-edit.jpg][image:
>>> IMG_6379-Edit-Edit_LuminarNeo-edit.jpg]
>>>
>>> On Friday, November 28, 2025 at 4:29:23 PM UTC-7 David Hyde wrote:
>>>
>>>> Thank you all for your remarks. I've studied the photos i took and
>>>> those online and it does look more like a Ross'sXCackling hybrid. I note
>>>> that Peter Burke spotted one on Lake McIntosh in January 2018! Not a rarity
>>>> but I've never seen one before so, happy to record this hybrid in my
>>>> records and spend a pleasant few hours sorting it out :)
>>>>
>>>> On Fri, Nov 28, 2025 at 3:37 PM David Suddjian <dsud......>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I think that is a hybrid Cackling x Ross's or Snow. Blue forms have
>>>>> more dark extending up the neck, differently patterned wing (more fancy)
>>>>> and quite a dark neck on Ross's (the Blue form of which is quite rare). And
>>>>> the goose it is with here is a Cackling - small size, small bill, steep
>>>>> forehead.
>>>>>
>>>>> The hybrid "cheeked" x white geese are fairly regular, usually with
>>>>> Cackling as their breeding range overlaps. Real blue morphs are fairly rare
>>>>> in the Front Range area but common our east in the prairie counties like
>>>>> Logan and Washington.
>>>>>
>>>>> David Suddjian
>>>>>
>>>>> On Fri, Nov 28, 2025 at 3:29 PM David Hyde <davidh......>
>>>>> wrote:
>>>>>
>>>> Hey Cobirders, I just spotted this goose in with hundreds of Canada
>>>>>> geese on Lake McIntosh in Longmont. Does it qualify as an adult blue-morph
>>>>>> Ross's goose?
>>>>>>
>>>>>> [image: P1140673.JPG]
>>>>>>
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