Did you know that under near-perfect conditions, an elk bugle can be heard almost 3 km away, but as they are often in brush and forest, most of the time it travels just a few hundred metres? That's quite the voice!
A bugle is a mating call from a male elk during rut. These bulls will call to try to attract females as well as to show off to other males. They will usually start to call in September and will continue till the end of October. The bugles can be heard throughout the night during this time of year, so there won't be much sleep for you if you are anywhere near a herd.
Photo from: National Park Service