From Surf Wiki (app.surf) — the open knowledge base

Kettle (birds)

Quality 0.00 · 0 views · Updated 20 days ago

A kettle is a group of birds wheeling and circling in the air. The kettle may be composed of several different species at the same time. Nature photographer M. Timothy O'Keefe theorizes that the word derives from the appearance of birds circling tightly in a thermal updraft "like something boiling in a cauldron." Ornithologist Donald Heintzelman has done more than anyone to popularize the term kettle, using the term at least as early as 1970 in his book Hawks of New Jersey to describe raptor flight, followed by uses in print over four decades. The related terms "cauldron" and "boil" are also heard to describe the same sorts of raptor behavior. Osprey-watcher David Gessner, however, claims a Pennsylvania lowland called the Kettle ("der Kessel" in Pennsylvania Dutch), near Hawk Mountain, is the source of the term.