Fall is an "energy expensive" season for bull Elk; They must guard their harems, battle other bulls, and also mate [October; Yellowstone National Park, Wyoming]
![Fall is an "energy expensive" season for bull Elk; They must guard their harems, battle other bulls, and also mate [October; Yellowstone National Park, Wyoming]](https://photos.smugmug.com/photos/i-nbhdhcw/0/L/i-nbhdhcw-L.jpg)
![Fall is an "energy expensive" season for bull Elk; They must guard their harems, battle other bulls, and also mate [October; Yellowstone National Park, Wyoming]](https://photos.smugmug.com/photos/i-WFw5MbH/0/L/i-WFw5MbH-L.jpg)
![Fall is an "energy expensive" season for bull Elk; They must guard their harems, battle other bulls, and also mate [October; Yellowstone National Park, Wyoming]](https://photos.smugmug.com/photos/i-wDDxn3z/0/L/i-wDDxn3z-L.jpg)