[kach22i]

Whiffling: The Art of Flying Upside Down
https://www.amusingplanet.com/2021/0...side-down.html

While it looks painful, such a maneuver is indeed possible and is a tried and tested way of braking, called whiffling. By turning the body upside down, the aerodynamics which usually give a bird lift during flying are inverted causing the bird to plummet towards the ground. Whiffling allows the bird to rapidly lose speed and height either for a fast landing or to throw off avian predators.

The behavior is seen in several species aside from geese including lesser yellowlegs, the black-tailed godwit, the northern lapwing, three species of scoter, and other members of the family Anatidae.