Its that time of year when the deer start to rut, the testosterone flows, which makes an great opportunity to shoot the males fighting for dominance and the right to mate with the females.
My advice is not to get to close, those antlers can do some damage, so a good focal length of 300mm+ on a full frame camera is idea. Get down low, ideally eye level or slightly lower I find makes for a better composition.
This shot was taken early in the morning just as the sun was coming up, if I had left it longer the light would have gone. A storm was rolling in and this was taken in the calm before the storm. I have found that when the weather forecast shows a large storm heading my way, the light before it actually hits can be really good. Just need to make sure that one's camera equipment is protected if you get caught out! I don't mind getting soaked through, but my camera does.