Have you seen any rodents?
Rodents including rats and mice and it seems like every once in awhile we get them in the Valley, back in 2011 and this last year 2016-2017. Roof rats mainly and they can be a real pain if you live in areas where they have become quite the nuisance. Sometimes we even get Pack Rats, I still have no idea how they survive the Jumping Cholla cactus. They will use that cactus to build their middens (their home) and no idea why they don’t get barbs everywhere. If you live in Arizona you know to stay way clear of this cactus, they don’t jump but they somehow manage to get to you and they hurt.
Also we should be concerned about cabins or sweeping up remains of the rats/mice etc, Histoplasmosis is a major concern.