Maybe I was looking in the wrong place, but I couldn't even find the size of the actual secure house part of the coop. I saw the nest box measurements (which was fine), and the total measurement (which they're calling the "house," but is actually the run), around 15 sq. ft of run space, which is pretty small, even for small birds. Even for bantum breeds (which I'm not sure if silies are bantums?), at least 5 sq. ft. of run space each is recommended, which would mean at least 20 sq. ft. for a run...don't know about a pigeon. I do NOT think that would be money well spent, IMO. It's cute, but I don't think much of it's substance.