Hi all, great forum! I inherited five Chickens with coop and roofed run from the next door neighbors when they had to move. They let the chickens run in their backyard during the day and they never had any problems. Their backyard is somewhat covered (70%) by overhanging trees. My backyard is open to the sky, unfortunately. The girls really are used to roaming about and like scratching around the yard. How great is the risk of airborne attack about 5 miles east of downtown Portland Oregon, in an urban neighborhood of 50x100 lots and homes? I only let them out when I'm home during the day. I set up a patio umbrella and table for them to give them some cover... but I worry about them when they are back there. They are standard sizes, 2 blue laced red Wyandottes, 2 blue Orpingtons, and a white giant Cochin. Thanks!