Misc. Facts:
 Scientists have identified 36 rattlesnake species.
 Rattlesnakes live only in North and South America.
 13 species and several subspecies live in Arizona, more than any other state.
 4 species in Arizona have special protection.
 Rattlesnakes use the "loreal pit," a heat-sensing organ between the nostril and eye to locate prey and potential predators.
 These snakes have glands that make venom, much like human saliva glands make saliva.
 Rattlesnakes can strike two-thirds of their body length.
 The rattle is a series of interlocking segments that are bouncing against each other, and made of keratin, the same material found in human hair and fingernails.
 The age of a rattlesnake cannot be determined by counting the segments of its rattle.
 Rattlesnake prey may include small mammals, birds, reptiles, amphibians, and centipedes.
 According to Arizona Poison Centers, less than 1% of rattlesnake bites result in human deaths.

Sorry, for over-sharing...I don't like snakes (even though at an earlier stage in my life I had two as pets), but I spend a lot of time in the Desert, and it pays to be able to identify what you just stepped on...