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Addie, who posted his video to YouTube, said the ram might have become territorial when it spotted its own reflection in the glass door to Blue Sky Adventures, a business in the Hotel Colorado building.
"He bumped the window a couple of times," Addie told The Daily Sentinel newspaper.
Addie said the ram then suddenly smashed the window with a hard hit from its horns before running away with its comrades.
Geoffrey Olson, a partner in Blue Sky Adventures, said the business is closed for the season, so no one was inside at the time of the incident. He said the sheep damage is just a part of living near wildlife.
"I remember probably seven years ago when a bear went through the hotel. And there's a wild turkey that lives right up the road here. We live in the mountains, right, so stuff happens," he said.
Colorado Parks and Wildlife spokesman Mike Porras said its currently rutting season for bighorn sheep.
"It's important to keep your distance because they're a little unpredictable right now," he said.