The elk mating season (rut) generally occurs from early September to mid-October. During this time, elk gather in mixed herds—many females and calves, with a few bulls nearby. Bulls will challenge other bulls in loud and strenuous fights. https://www.nps.gov/yell/learn/nature/elk.htm to learn more. | Yellowstone National Park

Walking in a winter wonderland... | Yellowstone National Park Lodges

Embrace a moment of zen among the steamy pools of Yellowstone National Park's Mammoth Hot Springs. | National Geographic Adventure

Uinta ground squirrels hibernate early: most have taken their two-note alarm calls into their burrows for the season and won't be heard again until next April. | Yellowstone National Park

1.8M views · 10K reactions | Just a bison casually strolling through a parking lot in Mammoth Hot Springs in Yellowstone. #wildlifephotography #wildlife #yellowstone #wyoming | Trent Sizemore Photography | Facebook

26K views · 1.3K reactions | Snow camping anyone? For those of you looking for some adventure and willing to brave the winter elements, the Mammoth Hot Springs Campground is the only campground open all year! https://www.nps.gov/yell/planyourvisit/mammothhscg.htm | Yellowstone Forever | Facebook