Imperial moth caterpillar

I My wife found this massive incredible caterpillar while camping a few weekends ago.  I had no idea what he was, so I didn't touch him.  The incident with the Saddleback caterpillar is still VERY fresh in my mind.  Based on my research the imperial moth caterpillar looks vicious but it is pretty harmless.
Incredible photos shared by the Flickr community group - Owls of North America. Click on the play button to begin the slideshow - ENJOY!