National Geographic on Instagram: "Video by Pete McBride @pedromcbride | During the fall in western North America, male elk (bulls) create a ruckus of bugles and calls during their mating season, known as the rut. That's when bulls are looking to attract female elk, or cows, and intimidate other bulls in the area. Each bugle is unique to the individual animal. Follow @pedromcbride for more on wildlife and natural sounds. #wildlife #elk #fall #autumn #colorado #fallfoliage"