I saw this caterpillar (and lots of his buddies) chewing on a milkweed leaf and wondered what was it.

After looking in my Audubon Society Butterfly identification manual ( I highly recommend this book)
I found the little hairy critter.  EUCHAETES EGLE  Milkweed Tiger Moth.

The photo of the caterpillar is not very good ...  I GOT BOTH PHOTOS from the website www.butterfliesandmoths.org.

The caterpillar was so fuzzy and interesting I had hoped for a beautiful butterfly, but as you can see its a  grey Milkweed Moth.