Elk, Wapiti (Cervus elaphus), bull calling, belling, Yellowstone National Park, Wyoming, USA

america american animal animals antler antlers artiodactyla belling bellow bellowing bellows bull calling cervus day daylight daytime deer deer deers during elaphus elk even even toed exterior exteriors fauna kingdom mammal mammalia mammalian mammalians mammals national nature nobody north of outdoor park photo photos red ruminant ruminantia ruminants shot shots states tetrapod the toed toed ungulate ungulates united us us american usa vertebrate vertebrates wapiti wild wildlife world wyoming yellowstone