[Tweeters] Gyrfalcon ID

[Thomas Einberger via Tweeters]

The best media representation of what I saw is this:
https://macaulaylibrary.org/asset/412094
I only saw the full underside of the bird from a distance (naked eye), but
I saw its belly, undertail, and right underwing through binoculars.

1. Can any vagrant juvenile Peregrine Falcon get anywhere close to as plain
medium-gray underneath as the bird in the video? This theoretical Peregrine
doesn't have to be fully unmarked, just subtly. Its belly, undertail, and
especially underwing need to appear solid medium-gray with small minor
hints of lighter gray.

2. The bird in the video and the one that I saw clearly have/had thicker
wings than a Peregrine's except when a Peregrine does this with its wings
(not my photo):
https://macaulaylibrary.org/asset/273072931
But, I only know of a Peregrine doing this for soaring. The bird that I saw
was doing direct (straight and flat) flight constantly and quickly flapping
its wings for 18 seconds straight. Would a juvenile Peregrine ever
constantly and quickly flap its wings in direct flight with its wings held
in the position pictured including during the flaps?

3. Another requirement is stiff shallow wingbeats. Juvenile Peregrines have
stiff wingbeats, but would they still be stiff by mid-February?
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