Cochise College   
Hiking Dangers in Arizona                                                        
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Roger Weller, geology instructor    last edited:  6/20/15

Scorpions like to hide in dark areas under stones and decaying vegetation. 
Always kick a rock over with your foot before picking it up. 
A good general rule is never put your fingers where you cannot see them.
In the following photos, the scorpions fluoresced under an ultraviolet lamp

Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.
copyright 2015 R.Weller