
Make sure your wires are close together and they can't push them apart.
I don't use wires, I used a flap for a long time and now I use sputniks. They can't get back out of a sputnik trap, you would think. Wrong.

I have a red stock pigeon that can stand in the trap and jump the 400 mm up through the hole.
Put a board over the trap when they aren't using it. That'll stop him.