Slide-Rock Bolter

The Slide-Rock Bolter is a monstrous creature that was reported to have existed by lumberjacks during the 19th and early 20th century. While there are no new sightings of these creatures, many believe that they still exist, but that they evolved into a more rock-like form in order to evade any threats to its life.

Description
The Slide-Rock Bolter was said to have inhabited the mountains of Colorado. However, it would specifically reside on the slopes of the mountains that were no more than a 45 degree angle. These creatures were whale-like in appearance having massive heads, sunken eyes, and a tail that resembled the fluked tail fin of a dolphin. These creatures' tails had grabbing-hooks on the ends of it, which they used to grasp the mountains. It would then wait patiently for any tourists or helpless animal to cross it. Upon finding food, the Slide-Rock Bolter would release its grip on the mountain, and slides rapidly towards its prey. With its colossal mouth, the Slide-Rock Bolter would devour everything in its path. The Slide-Rock Bolter would then climb back up the mountain after having its fill to wait for its next meal.

Sightings
The Slide-Rock Bolter was attributed to have been responsible for the many disappearances of tourists over the years. Its method of hunting was also blamed to have destroyed the mining town of Rico. According to legend, a forest ranger, whose district was between the Ophir Peaks and the Lizard Head, vowed to destroy the beast. Formulating a plan, the ranger uses a dummy as bait. Inside of the dummy was powder and fulminate caps. The ranger then situated the dummy, and waited for the Slide-Rock Bolter to take the bait. Sure enough, the monster falls for the bait, resulting in a massive explosion that leveled half of the buildings in Rico, making them irreplacable.

As mentioned, there are no recent sightings of the Slide-Rock Bolter. Many believe that these beasts still thrive in the mountains of Colorado either by being buried into the mountains, or being forced to evolve in order to evade any threats as well as to make hunting more efficient.