I bought a cheap little radio for my chickens. I turned it to the local classical music station, hung it on the wall of their coop, and VOILA!
Happy, mellow chickens.
They like it so much that I leave it on low volume at night. It seems to reduce the 3am crowing and make them all feel safe...
Last summer my little backyard flock was attacked by a weasel. I know it was a weasel because I went out in the middle of the attack and it vanished, after killing chickens that were inside a large kennel cage (for protection from the "raccoon" I thought had attacked them the night before.)...