However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing, kidney problems (such as change in the amount of urine). This is not a complete list of possible side effects.
They are more active when it is cooler, but they can and do come out of hiding at any time of the day. Here in the desert, Arizona Rattlesnakes can easily overheat and die if they cannot find a cool place to keep themselves cool.
Arizona Ridge-nosed Rattlesnake is official state reptile; One of four rattlesnake species with special protection in Arizona; Western Diamond-backed Rattlesnake (Crotalus atrox) Up to 66 long; Largest rattlesnake in the West; Responsible for more bites and deaths to humans than any other rattlesnake species in U.S. Black-tailed Rattlesnake (Crotalus molossus) Up to 48 long