Earlier this month, Preston Gladd was hiking near his home in South Park, Colorado, when he had a sudden change of plans. Gladd had been hoping to explore an abandoned mine at the end of a rural road, recommended to him by a friend. But when he arrived, a strange sound from within caused him to turn back.
"As soon as I got to the opening, I heard growling," Gladd told The Dodo. "I assumed a wild animal was living in there, so I just left. I didn’t want to get attacked."
The mine was indeed occupied — just not by the kind of creature he thought it might be.