My guess is Snow Geese which often moves in flocks of thousands.

On Mon, Oct 18, 2021 at 09:28 Nathan Pieplow <[email protected]> wrote:

> A flock of gulls sounds like a good bet. This time of year, I see large
> flocks of Ring-billed Gulls heading northwest over my house toward Boulder
> Reservoir in the early evening, on their way to roost for the night.
>
> Nathan Pieplow
> Boulder
>
> On Mon, Oct 18, 2021 at 8:29 AM 'ronbco' via Colorado Birds <
> [email protected]> wrote:
>
>> had a flock of many hundred slowly stream high over my house west of
>> Berthoud yesterday
>> they perhaps were heading to Dry Creek Res which is just a mile north of
>> me
>> so, yes they were heading north
>> they were high enough that I could not pick out any field markings and it
>> is driving me to distraction wondering what they were
>> the sun and their vector was such that all I could make out was: smaller
>> than sandhill and canada, bigger then mallard/duck, no color except perhaps
>> white on the back/underside, chunky body with a bit of an extended neck...
>> they were silent
>> flew in somewhat disorganized V's, needed steady, but smooth, flapping...
>> no gliding
>> could there be a flock of snow geese that large in the area?
>>
>> Ron Bolton
>> Berthoud
>>
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