Bushy Park was not open till 8am so we wondered if we would be too late for good atmospheric images but luck was on our side as very soon after parking the car we located a large group of deer ideally placed to take advantage of the mist and the early sunlight showing up the breath. The large group included Red Deer and a few Fallow hines. There were a couple of mature stags, one of which roared a few times for us, and several young males on the periphery. I did not know a lot about the social interactions and breeding cycle of Red Deer so read up the following article which is full of fascinating facts such as it is the hines that choose the group to associate with rather than the stags rounding and protecting the group though this also occurs.
Red Deer Breeding Biology | Wildlife Online