Delaney, who grew up on a cattle ranch, took the whole ordeal in stride. The video even shows him retrieving the camera with a hockey stick as his wife Katie looks on.
Hunter or Hunted? Animal Eyes Reveal All: Photos
"I've always been interested in snakes," he told the Billings Gazette. "I think they're pretty cool animals, and I have a lot of respect for them. I think they have a place in the environment. I'd rather have some snakes than a rodent problem."
Residents of Montana can rest a bit easier, as these and other rattlesnakes usually hibernate there from about mid-September (when the first frost hits) until the last frost date in March or April.
A Northern State University fact sheet mentions that the snakes "often return to the same den year after year with the young probably following the scent trails of the older snakes. The snake dens may contain great numbers of rattlesnakes, bullsnakes, blue racers and even garter snakes."
Video: How Snakes Got Their Venom
In South Dakota, the dens may have as many as 1,000 snakes, although the usual number is about 250.
In other locations, such as California where the temperatures are warmer at this time of year, rattlesnakes are still congregating.
They usually do this in northern areas of their range and at higher elevations, selecting crevices in rocky ledges for protection. As they gather, they often wrap their bodies around each other, creating a massive slithering ball. This helps with temperature regulation and facilitates social interaction.
Photos: First Snake Crawled on Four Feet
When the snakes go off to hunt, they prefer doing so on warm nights. One reason is that they serve as prey for predators too, and can avoid them better under the cover of darkness.
Until colder temperatures set in, take care where you and your pets walk if you live in rattlesnake country.
As Delaney said, "I never walk into an area without knowing what I'm stepping into."