Yes, a collar with a bell reduced predation by cats, and is recommended by the Royal Society for Protection of Birds, among others. Now, to be fair, it is not

Yes, a collar with a bell reduced predation by cats, and is recommended by the Royal Society for Protection of Birds, among others. Now, to be fair, it is not without its cost. It happens that cats get it tangled in fences or other obstacles and die by strangulation or predation.