Encountered lots of them regularly over the years in AZ, including the smaller/lighter colored "bark" type noted above. The larger they were, the less we seemed to worry. Ran into them from the very low desert near Yuma up through the mile-high plus areas around Prescott. But, 200 miles east and still in the SW, but at nearly 8,000 ft. elevation, have not seen a single one in 16 years. Maybe need to look more closely in likely places.
