Kites - A menace to the low flyers.
Was down wind in the Ubon, Thailland, circuit in a Canberra circa 1965 when tower called to advise "watch out for kites on final"
Asked the Nav "what sort of birds do you think they may be?"
None seen until short final and just discernable against the background houses were 3 kites on the end of strings requiring a zoom up and over.
Mini barage baloons!!
Too bad about the occupants of the R-22.