Yellow Caterpillar on Creosote Bushes – White lined Sphinx moth – Hiles lineata

On my run today I noticed alot of yellow with black stripe caterpillars on the creosote bushes along the jeep trail at south mountain park.   

I found this photo on the web.  It is a bit more green but is the caterpillar I saw.  Common Caterpillars of SE Arizona   ( amazing photos of Arizona Caterpillars )

 This is what he turns into later in life.  

I have always liked moths.  They aren't as showy was a butterfly but they get the job done.

White-lined Sphinx moth, Hiles lineata