Editor's note: They do us a great service by consuming small tick-carrying mammals, therefore lowering the tick population and, with it, the instances of Lyme disease. And they have a key feature in common with humans: their rattles are made of keratin, the same substance that composes our hair and fingernails. Enjoy a stunning collection dedicated to these hard-working reptiles, and get some cool Rattlesnake wallpapers for your screens!