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.
Most ants in Tucson are active during the warmer parts of the year (late winter through early fall). They can be active both at night and during the day, depending on the time of year and the weather. Arizona has the highest diversity of ants in the United States, with over 300 known species.