I did some reading about owls after a real family of 3 owls (adult with the 2 babies
moved into the hay barn next door to my garden. They were of enormous help in keeping down the mice and rabbit damage to the garden, I believe. At least, the damage was a good deal less than in previous years.
There were lots of "owl pellets" with mouse bones on the floor of the barn. Also, the skin and bones of at least one rabbit. And, plenty of bird feathers - doves, pigeons, flickers, even the feet and wings of a sea gull!?!
At any rate, I came across recommendations by a natural resources guy on using
decoys to keep pests out of the garden. His recommendation was to move the decoy multiple times during the day.
He wrote that it wasn't necessary to move it far. Some of the time, just turning it on its perch was sufficient but it should "travel" a little around the yard. And, having it somewhat hidden most of the time was a good idea.
From watching the live owls, I realized what he meant. If the owls were still out at sunrise, the magpies would sometimes mob them. They would hang out in the evergreen branches thru the day if they weren't in the barn. Of course, you want the critters to actually SEE the decoy but if they can't see it real well AND it moves around, they become anxious and don't stay around.
Some of the starlings had nests right in the barn with the owls. I don't think the baby starlings got out alive, tho'. Honestly, I have NO idea how your chickens will react to the decoy.
Steve