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.
WESTERN DIAMOND-BACKED RATTLESNAKE. Crotalus atrox. DESCRIPTION: Arizona's largest rattlesnake (up to 1,676 mm or 66 in total length excluding rattle). Coloration is gray or tan, sometimes with a pinkish, rust, or orange cast especially on the posterior portion of the body. A row of large, brown to sandy-brown, diamond-shaped blotches lines the back.