Elk, Wapiti (Cervus elaphus), bulls fighting, Yellowstone National Park, Wyoming, USA

aggression aggressions aggressive america american animal animals antler antlers artiodactyla battle battles bulls cervus day daylight daytime deer deer deers during elaphus elk even even toed exterior exteriors fauna fight fighting fights kingdom mammal mammalia mammalian mammalians mammals national nature nobody north of outdoor park photo photos red ruminant ruminantia ruminants shot shots states struggle struggles tetrapod the toed toed ungulate ungulates united us us american usa vertebrate vertebrates wapiti wild wildlife world wyoming yellowstone