Venomous Snakes - Rattlesnakes, Sidewinders, Cottonmouths, Copperheads

Growing up in Montana and New Mexico, I had plenty of chances for learning about some of the most dangerous aspects of hiking, camping, and otherwise enjoying the great outdoors in those areas. Most of the time (except when they are molting), the rattlesnakes will be "kind enough" to "warn us" when we get too close to them--they rattle to warn off creatures bigger than they are (obviously, they don't want to get stepped on). However, when they are sneaking up on prey, they don't rattle--they just coil and attack. So, the only ones that need to worry about this might be the kangaroo rats, mice, rats, rabbits, prairie dogs, ground squirrels, road runners, grouse, and other small creatures in their habitats.