When you put them side by side with their heads up, you can clearly see the difference. As far as mice, they are attracted to the chicken feeder. All you can eat buffet 24/7. Some chickens will kill and eat them but mine just stare at the floor while the mice run around. Even my guineas are useless with mice. If my cat goes up to the barn where the coop is the guineas promptly chase her back to the house. I've resorted to poison. Not the ideal solution but I can't stand to see 5 mice in the feeder every time I go in the coop. I'll put it inside a cage that the chickens can't get into right over the mouse holes. Once I see they've eaten what I put out, I'll remove the cage. I probably have to do it every 3-4 months. Right now mice are at their worst because they have moved inside to get out of the cold. Try suspending the feeder if you have that style. That would limit the mice to what's on the ground.