I used to have a duck. The duck broke his/her leg a year or so ago, and it did not heal properly, so it had limited mobility. The duck's previous owner didn't want to cull it, since it did not seem to have any pain, so they ask my family to take it. All was well until a few days ago, when the duck suddenly disappeared just two hours after my wife freed it from the chicken tractor it slept in at night. We weren't sure what happened to it until today, when we saw an owl looking over our yard, looking for another meal. We certainly do not want to loose a chicken the way we lost that duck. Our chickens only free range for an hour a day, in the late afternoons, but we cannot always stay out in the yard to supervise and protect them. What can we do, to protect our chickens (RIRs and Buff Orpingtons) from this owl?