The video contains content that may be disturbing to some readers.
According to a report from Fox News, the video came from a trail camera placed by a California resident named Randy Spade. An avid hunter, Spade has about 30 trail cameras set up on a private ranch owned by a family friend.
"Bears are the main thing we see," he told Fox News. "Summers are hot up here. We have 30 to 40 days in a row of 100 degrees, and bears love taking a bath in those old watering troughs to cool off."
But when Spade reviewed footage from a watering hole in early June, he witnessed something he'd never seen before. A deer walked into the frame, triggering the camera. Seconds later, the glowing eyes of a cougar appeared in the darkness.
The big cat lunged at the deer with blinding speed. After the deer was subdued on the ground, subsequent video clips showed the cougar drag it away in the night.
"I was surprised by how fast it struck," Spade told Fox News. "It was in the blink of an eye."
This video serves as a stark reminder of the threat of mountain lion attacks on domestic pets. Here are some practical tips to reduce the danger of your pet being attacked:
Keep your pets indoors from dusk to dawn
Secure your pets in the yard with an enclosure, not a chain
Feed your pets indoors
Trim brush in your yard to reduce hiding places
Install motion-activated lights around your house