It's a move that's sure to impress even the most skilled circus
contortionists. During flight, geese can twist their necks to flip their bodies
upside down, while keeping their heads upright.
Now amateur videographers Hans de Koning and Lodewijk van Eekhout have captured
the first slow-mo video of the manoeuvre, winning a prize in a competition
organised by the Flight Artists group at Wageningen University. Known as
whiffling, the move is often performed before landing as a means of braking.
Upside down wings generate more drag causing a goose to slow down quickly, just
like what happens when a plane is inverted during flight.
