Abstract: An anti-bird perching device which can be installed by draping over railings, water pipes, wire cables or the like, either as a permanent or temporary barrier or deterrent for keeping both small and large birds from landing or perching on the understructure to be protected is described. The device comprises two identical panels made of a wire open rectangular grid fencing which said panels are hingedly attached to one another at spaced horizontal points, and wherein the wire material above the hinge points define two parallel rows of crisscrossing upwardly projecting wire prongs or spikes defining a surface which deters birds from landing or perching thereon. The hinged attachment permits the two-wire panel units to be pulled apart for installation or collapsed tightly together for compact shipping and storage applications. A method of installing multiple barrier units along a span of electric cable, telephone wire or water pipes and the like is also disclosed.