(CNN)It is elk mating season and finding a partner could get dangerous.

Yellowstone National Park warned visitors Friday that the season, called the elk rut, has begun and aggression could be turned toward humans passing by. The rut stretches from early September to mid-October, when bull elk “bugle” or call out to “announce their availability” to females and challenge competing males, the National Park Service said. Sometimes the bulls battle for females.Yellowstone shared a video on Twitter Friday of two bulls wrestling with interlocking antlers.

WARNING: The elk rut has begun in Yellowstone National Park. Bull elk can be extremely dangerous during this time. You are responsible for your own safety.https://t.co/YTbWAr7Shw pic.twitter.com/aCUNE5hpKn

— yellowstonenps (@YellowstoneNPS) August 28, 2020 People have been severely injured during bull elk battles, the NPS said. Visitors are warned to keep at least 25 feet away from elk, which can run quickly and change directions abruptly, and to find shelter as quickly as possible if one charges.Read MoreThough dangerous to people, the loud fights are rarely injurious to elk. Keeping their antlers through the winter means that bull elks don’t have to duke it out with their front hooves, which could lead to injuries. Usually, the weaker elk of the two gives up and wanders off, the NPS said.

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