WE had something like that happen at our house but the other way around, we had about 30 or so chickens sunbathing in the middle of our garden, just hanging out and enjoying the day. out of no where comes one of our loose rabbits and jumps right in the middle of them. Chickens everywhere and the rabbit runs off.
The hens finally got back down to bathing and from another direction here comes the same rabbit, jumps right in the middle of them, they scatter and she (the rabbit) runs away again.
the chickens gave it up and moved futher away from each other so that they were in a pile. No rabbit in sight.
Not as much fun unless you can get a good pile of chickens and scatter them.