It is common knowledge that deer of all species use their antlers for sparring and fighting during breeding seasons.
Usually these fights are short lived and rarely result in any sort of significant injury to the participants.
However, that is not always the case. For proof, consider this video.
These two bull moose, filmed on a gravel road in Maine, are shown staring each other down, rubbing hooves on the ground, and lightly hitting their impressive racks against one another. Nothing too...