I use these plastic spikes. [1] Not even sure if you can call them spikes, moreso just protrusions. They aren't sharp at all so they don't impale the pigeon, only stop it from roosting. They work really well because the pigeons just aren't comfortable sitting on them.
I agree with you about sharp metal spikes. Those are really terrible and I feel bad for any bird that gets injured by those.
I agree with you about sharp metal spikes. Those are really terrible and I feel bad for any bird that gets injured by those.
[1] https://www.amazon.com/Bird-X-Plastic-Polycarbonate-Spikes-A...