"Desert Animals: Inside Out" Through the use of fluoroscopy or live- action x-rays, learn how insects, reptiles, birds and mammals eat, move and function. See how bones and joints work from the inside, and learn how some animals have uniquely adapted traits for living in the desert. Also, a close-up look at the outside of some desert animals. See how a rattlesnake's skin is designed and so tough that it is hard to penetrate, yet designed for a smooth glide across the desert floor.