The top one, just so everyone knows, doesnt actually stand upright like he is doing in the pic. He is just really small and trying to balance in that one, doesnt walk upright like I have seen runners do. I was wirried whan I took the pics that everyone would think it was a natural pose, but he was scared and I barely got this pic of him being somewhat still.
Not saying he isnt a runner, but he doesnt carry himself/herself like one.
I have a small male duck in with my chickens, he never mounts them or bothers them, just uses the ladies for body heat at night. Piles right in with them. However, my old muscovy would mount anything that was still long enough. Cats, stray dogs, chickens, rocks, anything.