I am starting to observe an increase in Hawk population in my area recently. Previously I've lost chicken but most of the time had no idea what abducted them (I wouldn't find any trace when they went missing. Recently the attack took place about few feet from me, so I got to witness it. It was a large Cooper's hawk or red tail (I was too shocked to really identify). Fortunately my Roo, Nigel live to crow another day. I used to allow my chicken to Free Range all the time but recently they move around under a PVC chicken tractor. I don't like it and chicken don't like it. I can't blame them anyway. But hawks are patrolling the area everyday. Never seen that many around here . Maybe a lot of the Hawk family has new edition. Around 2-4pm are the worst time for chicken as Hawk like to glide through our area. Not much I can do other than hang around with them outside or keep them in lockdown. How do you protect them from these Avian attack if Free Ranging is something you really like your chicken do?