The pet cats I've had and have and the ferals I've befriended have all been wonderful to my chickens. Two of the ferals (around in different years) fell in love with the chickens and just wanted to be near them. Slept outside the coop door anxiously waiting for their feathered friends to come out in the morning. I teach all the animals that the others are family (by being nice to the cat and then showing the cat that I'm also nice to the chickens they comprehend that the chickens are part of the family) and as a result, they never show ill intent. In my case, I think they added/add protection. I smile every time I think of these 2 beautiful ferals (I got them neutered of course - and I fed them) laying belly up by the chickens and purring to beat the band. They LOVED them. Hen Betty used to catch feral kitty Floppy's tail in her beak, just to be a smart a55. Floppy stood patiently, gently, waiting for Betty to let go. Once she did, he sat down near her and purred.
JJ
JJ