Good info...We have a townhome in Albuq. NM and we notice last year under our patio cover we had alot of flies, and I mean alot of flies. Now I notice the flies are again back, and now flying around our front door. We have pigeons on our roof and surrounding homes. We didn't invite them, however a neighbor in back of us put a pigeon/bird feeder out - and now I'm sure they are roosting on our roof. HELP HELP HELP. Do those pigeon deterrent spikes work? Will I also have to call a pest bird control?