Rachel,
Caterpillars are tough under most conditions. I con't do well at all when
working form memory. But you might try this web site
http://www.npwrc.usgs.gov/resource/2000/catnw/catnw.htm

John

John Fleckenstein, zoologist
Natural Heritage Program
Asset Management and Protection Division
EMail: John.Fleckenstein at wadnr.gov
Phone: 360-902-1674