
This is a snapshot of a Greylag Goose in mid flight, doing what is known as "whiffling".
Merriam-Webster Dictionary explains:
Main Entry: whif·fle
Pronunciation: \ˈhwi-fəl, ˈwi-\
Function: verb
Inflected Form(s): whif·fled; whif·fling \-f(ə-)liŋ\
Etymology: probably frequentative of whiff
Date: 1568
intransitive verb
1 aof the wind : to blow unsteadily or in gusts b: vacillate
2: to emit or produce a light whistling or puffing sound
transitive verb
: to blow, disperse, emit, or expel with or as if with a whiff
Basically, when any bird whiffles, it is trying to disperse the air under it's wings to reduce the lift it has so that it can land.
From what I understand, there is no fixed whiffle pattern. This Greylag Goose is doing one of many variations.
SO, what makes this interesting/marvelous/etc.? It is probably the fact that the Greylag Goose is a large goose, 74–84 cm (29–33 in) long with a 149–168 cm (59–66 in) wingspan and a body weight of 2.3–5.5 kg (5–12 lbs).
To draw a crude comparison, it's like seeing Ruben Studdard (of American Idol) do a triple backflip! Please do not miscontrue this as a mockery of fat people. It is a realistic physical limitation and I would be very personally impressed and happy if a person of such significant heft is able to do so.
But all that political correct-ness aside, the aerobatics of birds occurs around us everyday but no one really stops to appreciate the world around us.
Time to Shift Your Paradigm

