We were hiking in Saguaro West NP when I spotted this Regal Horned Lizard. At the time I had only my 85 mm macro so I got at ground level to get as close as I could.
(Please view in original size for best quality.)
I took several images when all of a sudden the lizard rushed right at me. It was quite a surprise to see this lizard coming right at you as you are looking through the lens.