So why do you guys think there are so many bunched up like that????
Probably a winter den, as rattlesnakes hibernate in large groups. I've come across similar sights in Idaho.
I kept a rattlesnake as a 'pet' for several years, though I damn sure didn't pet it. An interesting animal, and moody as any person. There were days you could lift him out of the cage and let him run around the yard for exercise, and he was as placid and content as, well, a placid and content rattlesnake. Other days he'd start buzzing if you got to within fifteen feet and it was clear that anything that went inside his cage was going to get bit.
I use to be real afraid of rattlers, then I spent several years in countries where the snakes don't rattle, they just lay quiet until they bite, and then you die a horrible though fairly quick death. Made me appreciate the virtue in a snake with an attached noisemaker.
I now appreciate rattlesnakes for several reasons. First off, they are one of the few things that are actually exciting to come across when you're out and about. Seeing an eagle is neat, but it doesn't get your heart rate up like that buzzing sound.
Second, rattlesnakes live almost entirely on burrowing rodents. Burrowing rodents carry hantavirus and the bubonic plague, and they dig up airstrips...three things a whole lot more deadly to a pilot than the one in fifty-thousand chance of getting snakebit. Last I knew hantavirus has a fifty percent mortality rate and there is no cure...hell of a lot more deadly than any rattlesnake.
Last time were were camping at the Chicken Strip a rattlesnake came through camp while we were eating dinner under the wing. He checked out each of the tie down ropes and eventually slithered off towards the tail. We never quit eating and eventually lost sight of him, at which time we just forgot about it.