a young elk calf with elk herd in autumn

action adorable aggressive animal antler antlers aspen autumn beautiful behavior breed breeding bugle bugles bugling bull calf calk call canadensis cervus colorado colors danger dangerous day elk fall fog foggy grass grazing harem herd horn hunting lake lakeside large mammal mate mating moraine morning mountain national nature park protecting protective rocky rut rutting season securing sunny territorial trees trophy ungulate vegetation wapiti wild wildlife young