horses' rumps

I had to climb a hill, up a narrow lane which was fenced on either side. The lane was crowded with horses and a few donkeys, also travelling up the hill. As there were so many of them, they were moving at a slow speed and I needed to maneuver my way through them so that I would reach the top at a much faster rate. All I could see ahead was a sea of brown, grey, white and black horses’ rumps and donkeys’ rears. I had to duck and weave my way through their legs without worrying them; I was anxious that if I disturbed them, they would kick their strong legs back and injure me. I had no choice, so I chanced my climb to the top.