To the best of my knowledge, this is some kind of Fritillary caterpillar. I captured this image with my Canon SX30is, using digital zoom at 75x. I don’t usually use or recommend digital zoom.  It gets real ugly real quick.  But this camera is amazingly good at it.  The 75x setting approximates almost 1700mm in regular camera terms.

Click on the image to enlarge and see full detail.