WILDLIFE WATCHING -- Spring and fall are the best times to find rattlesnakes congregated by a den, if you happen to stumble upon one.

Montana resident Michael Delaney took this video -- clearly he was wearing leather boots and chaps -- and offered this insight:

The den is only about 1/2 mile from our house, and we just came across it one time. The best times to find them at the den are in the spring when they're coming out and in the fall when they're going back in. During other times of the year you usually won't see anything there. Then den is right next to a tall creek bank, I think they use the cracks and holes from erosion as their den. 

IF YOU'RE SQUEAMISH about snakes, do yourself a favor and don't watch this video.

I post this to illustrate what you could walk into in portions of Eastern Washington and Idaho... and why you would want to back out immediately.