Fladry

Fladry is a line of rope mounted along the top of a fence, from which are suspended strips of fabric or colored flags that will flap in a breeze, intended to deter wolves from crossing the fence-line. Fladry lines have been used for this purpose for several centuries, traditionally for hunting wolves in Eastern Europe. They are effective temporarily, as the novelty may soon wear off, usually between three to five months, and can be used to protect livestock in small pastures from wolves.