With the way my parents vacation, I would not be surprised (but it looks to be fairly easy to scoot from Vegas into Arizona into UT, they like driving). Before I got that one photo my mother had sent numerous photos of Denny's, casino reels, a buffet, and then my brother holding two huge stuffed fish. I no longer know where they are, only that it's hot and they are walking a lot.
I didn't know Saguaros weren't native to NV or UT! I just assume if it's dry/hot that a cactus should grow (I am slowly killing my little cactus garden at my desk, I think the windows are either magnifying the sunlight and burning them, or the window is transferring too much cold near them, also it's really dry in the office, so I keep watering them since they're getting...puckered).