Scenario: 3 hens, ranging 17-20 weeks old. They live in a run attached to a henhouse, but we let them out in the morning the roam the back yard while we eat breakfast out there. Yard is fenced with a normal-height wooden fence, but there's also a hip-height chainlink fence *inside* that fenceline for some reason. Anyway, the other day I couldn't be out there all morning but I let the chickens out anyway. Usually not a problem. But this time one of the neighborhood cats decided to bother them. From in the house I heard LOUD clucking and ran outside to find a crouched-down cat in the middle of the yard. Two of the hens were perched on TOP of the back fence ready to jump into a parking lot and the other hen was near another fence looking like she wanted to jump up. Anyway, chased the cat away. Somehow convinced the birds to get down off the fence. If they'd flapped into the parking lot over there, I could've been chasing chickens through the streets. :-( What should I do for the future? I'm thinking one or all of the following: Get rid of the inner chainlink fence (if that's helping the chickens get up). Clip their wings (will they soon be heavy enough NOT to be able to fly up though?). Add pigeon-preventer spikes all along the fenceline and on top of their henhouse roof which is near the fenceline. Thoughts? Are cats REALLY a threat?