CDs and hawks

I have seen threads of things to deter hawks but do CDs work? Anyone have experience? and if it works how many and where do I put the CDs.

I have a covered run but the chickens love to free range and we only let them out when someone is around, except even a human is not a deterrent. Yesterday, a hawk zoned in on a chicken but as it was coming down a mourning dove got in it's way and scared the hawk off. It was actually pretty fun as the hawk tried to stop and literally looked like it was flying away with it's tail between it's legs.

Some claim success, but they have not worked for me.

I've had a hawk take one of my chickens right under some Cd's.

I second that. CD's do not work. I had the exact thing happen, hawk took a chick right from where I had all the CD's hanging. Don't waste your time.

Depends on what's hunting (location here is wooded). Merlins, Kestrels (and their ilk) along with Sharp Shinned are small (relatively speaking) and, more often than not, exhibit low angles of attack, and when they do stoop, they spend more time low above the target before the dive. Large Breed chooks with a bit of cover will cut down on any losses from these "bantam contenders". Saw a Merlin as it caromed from the flank of a BSL hen. Hen noticed the raptor as it winged away - earning only a growl. Have a resident Red Shouldered Hawk (five years, now) that wings above runs, but has never bothered with the chooks/turks (more on that in a moment). Red Tails arrive with the wind, but they make their examinations of runs from height, they'll observe from roosts in trees surrounding clearing around house, but have never gone into that "quick float" to zero target before torpedoing dinner"(stooping through tangles of branches is not ideal - and what additional "interference" I can provide I will).

Turkey hens are best (one of our Mottled's flew out of run to harass the Red Shouldered - hen had apparently made several circuits of the hawk on the stump - I only caught the end of the "stand-off" - hawk "squirts from disgust" and flies off):
Anyway, neighbors up the road have lost chooks, in their run, to Red Tails (over past decade), we haven't. Can I say that the CD's & pin wheels didn't account, in some fashion, to the variance in predation? No.

https://www.backyardchickens.com/t/44145/hawk-saucer