These huge toads are common at night in southern Arizona during the monsoon season, when the humidity is high and thunderstorms occur almost daily. Or at least, that's what the weather is supposed to do. When I visited for about a week at the height of the traditional monsoon season, there were only two days with any precipitation at all, and this was not one of them. Apparently some of the toads were getting desperate and hopping around anyway. The dry dirt on this one's back shows that the recent weather had not been toad-friendly.