I’ve heard that too, but never thought to try it with the pigeons. I had hundreds of them nesting in my indoor so finally bit the bullet and boarded up all the gaps between the walls and roof, and that worked eventually. But now they’re in one of the smaller barns and I’m having trouble keeping them out of there, so the cd’s are worth a try!
We tried that and birds ignored them.
We even bought a commercial product that looks like a flying bird with optical facets and highlights in sunlight, with zero results.
We got rid of our pigeons when a barn owl pair moved in.
Today we have a couple dove/rock pigeons left and hardly no smaller birds in the barn.
The female owl is still here, every once in a while we find feathers or rabbit remains of her nightly hunting.
We also don’t have that many places for birds, no trusses but plain clear span framing in our barns.
Barns with exposed rafters are a heaven for birds, hard to keep them out of those.
Birds of prey can’t hunt in there, only catch those that fly in and out of that maze trusses are.
Birds and their dust can be a serious problem in barns for humans and horses.
Birds can be incredibly messy where they congregate.
