One afternoon I watched the chickens on the lawn foraging. One buff Orpington walked up to another buff Orpington (same color) and grabbed it. Being quick thinking, I realized that one of them was a fox!
A dozen chickens on the lawn and none of them reacted to the presence of a fox. I have...
The only thing keeping our local fox population from my chickens is an electric fence. One reason I have Brahma is because they are too heavy to fly over the fence. The electric netting also keeps out possums and raccoons, and usually dogs and cats.