Whiffling is a term used in ornithology to describe the behavior whereby a bird rapidily descends with a zig-zagging, side-slipping motion. Sometimes to whiffle, a bird flies briefly with its body turned upside down but with its neck and head twisted 180 degrees around in a normal position.

WHIFFLERS AND WHIFFLING
WHIFFLERS AND WHIFFLING
The Wonder of Whiffling
WATCH FOR THE WHIFFLING GOOSE
WATCH FOR THE WHIFFLING GOOSE
Whiffling and Burbling in the Realms of Gold
Whiffling and Burbling in the Reams of Gold.
The Wonder of Whiffling: And Other Extraordinary Words in the English Language
A Freedom Box for 'A Hot Whiffling Puppy' Tighe Family Silver from Kilkenny
The hospital treatment of the schizophrenic patient. The jabborwock, with eyes of flame came whiffling through the tulgey wood and b...