»fladry

A fladry [line] consists of rope with strips of fabric, often red, to deter wolve. Fladry lines have been used for several centuries.

According to Polish Scientific Publishers (Wydawnictwo Naukowe PWN, SA), fladry is the plural of the German flader or flattern, "to flutter." Fladry is probably not related to the Polish flądry, the plural of flądra, which signifies either "a flatfish" or "a slattern" (from the 2002 Oxford PWN Polish English Dictionary, which is not available online, but see this paper on machine translation [pdf]).

In English fladry tends to be used in the plural only, meaning you can have “some fladry,” very rarely “a fladry,” and never “some fladries.” The term has a cognate in French.

Researchers from the University of Calgary discovered that wolves will not cross this type of barrier for up to 60 days when it encloses livestock. In addition, it has recently been adapted to include an electric current, called Turbo fladry, which may provide a longer period of protection.