Shake out sleeping bags before use. When climbing always look before putting your hands in a new location. Snakes can climb walls, trees, and rocks. They are frequently found at high altitudes. Remember rattlesnakes are excellent swimmers.
Baby rattlesnakes are just as poisonous as their parents.
They can and do bite. Never hike alone. Always take along a buddy who can get help in an emergency. Learn basic lifesaving methods. The Red Cross and various hospitals offer regular classes.