I can just picture the reaction of your neighbors if you decided to use this auditory option as a coyote repellent near your coop: "After losing 3 of our 20 cats to coyote attacks at our 20 acre Texas ranch home, a local hunter got together with an audio engineer to produce this 80 minute audio CD." http://www.runcoyoterun.com/ The CD is 80 minutes of cougar growls and screams, at 5-7 minute intervals. Has anyone tried this? Supposedly, it also works against raccoons and foxes, if testimonials are to be believed. I read the FAQ page and it sounds workable.