Even though I don't want the pigeons on my terrace, I would not hurt them ( maybe ). Years ago without my knowledge, one nested behind a large plant that I had. When I discovered it, there were two eggs in the nest. I couldn't bring myself to get rid of the eggs. I let the mother sit on the eggs. When the baby pigeons were born, the mother would bring them food. I placed two aluminum foil pans by the nest. One with water and one with bird seed. The baby pigeons grew and would move around the terrace behind the plant. If they moved too far away from the plant I would place them back in the nest. I let them stay but with my rules! LOL!! Eventually they flew away and I felt sad that they had left. I've had the Bird Spikes for three years now and never did I see a pigeon on the terrace again since usually a pigeon will fly onto the railing first before it flies into the terrace. This year around March during storms I noticed one white pigeon resting atop one of my hanging basket at the back of the terrace. I felt bad because of the weather and left it alone. One day I noticed the white pigeon across the street perched on top of the Astoria bank with other pigeons. The other pigeons seemed to be ignoring him and flying away from him. I guess pigeons can be racists also ! LOL!. The white pigeon continued to come to my terrace and I left him alone. I knew it was a male because I would see him going to another pigeon and fluffing up his feathers to impress the female, but the females would fly away from him. Then one day I realized that he hadn't come to the terrace and saw him one day with another pigeon gathering twigs for a nest. I guess there is always a pigeon that will fall for the outcast. I still see him around and I'm hoping he won't be one of the victims to the Seagulls. The Seagulls when hungry will attack the pigeons and kill them for food. I have witnessed this numerous times on the Astoria Bank's rooftop. It's not a pretty site.