Yes, timber rattlesnakes are endangered in a number of midwestern states, as are prairie rattlers elsewhere. Northern's attitude is why. For some reason, people thought it was fun to kill massive numbers of them in their winter dens.
Personally, I like the local rattlers--Pacific diamondbacks. They really prefer to rattle rather than strike, and as long as we're mutually respectful, we get along fine. They go their way, I go mine.
Thing that I don't particularly like are rats and mice, and that's what you get if you kill all the small predators. Rats carrying plague and mice carrying hanta virus, just to name something that the local rodents have. Personally, I think fat, happy rattlesnakes are much better than bubonic plague, any day. Sure they're dangerous, but a lot less so than most of the SUV drivers around here.
F