"Contrary to popular myths, many stallions do not live with a harem of mares. Nor, in natural settings, do they fight each other to the death in competition for mares. Being social animals, stallions who are not able to find or win a harem of mares usually band together in stallions-only "bachelor" groups which are composed of stallions of all ages. Even with a band of mares, the stallion is not the leader of a herd, but defends and protects the herd from predators and other stallions. The leadership role in a herd is held by a mare, known colloquially as the "lead mare" or "boss mare."
Well there you go, I learnt something today...
congrats on the BWS "bachelor group" nulla!