Sat, Oct 11, 2008 at 1:48 PM
I found this character hiding in a willow tree today. He hooks his tail around like a scorpion in a treatening manner when I stroked his back with a leaf.
Wondering in Waplole
Your caterpillar is one of the Prominent Moth Caterpillars, most probably the White Furcula, Furcula borealis, based on images posted to BugGuide.