This is the terrifying moment a full-grown bull moose charged at an unsuspecting hiker - who was lucky to get away unscathed.
Footage shared by Colorado Parks and Wildlife (CPW) shows the large mammal eating from a tree as the man films nearby.
But what appears to be a peaceful moment soon turns dangerous - as the moose suddenly charges at the camera.
Posting the clip on Twitter, CPW said: "This video is an example of being too close to a bull moose and how quickly they can decide to charge on you.
"It is from Clear Creek County. The individual just by chance came upon the bull walking along a willow bottom heading towards a lake.
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"Thankfully no injuries occurred. This person managed to get behind a tree and the moose hit that."
In a public safety video uploaded three years ago, CPW said moose attack humans more than any other wild species, and attacks have been on the rise in recent years.
A moose can grow to be six-feet tall at the shoulder and weigh up to 1,000 pounds, the video said.
It added: "Colorado has a 'healthy population' of over 2,500 wild moose roaming around the state, which has led to the increased attacks.
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"They are now appearing in many of our busy mountain towns, rural neighborhoods, tourist destinations and ski areas,” said director Elissa Sleza.
"While this creates exciting opportunities to view these fascinating animals, dangerous conflicts between moose and people have become increasingly common in recent years."
And, revealing CPW's "number one rule" for encountering a moose, Ms Sleza added: "Never approach a moose or attempt to take a close-up photograph or selfie."
The video of the moose charging at the hiker has been viewed 22,000 times, with dozens of people leaving comments.
One person said: "And this is why we have zoom on our cameras, so we can get good pictures and video from a safe distance."
Another added: "Word to the wise, don't film a nearby animal that can run twice as fast as you."
