Geographic location of the bug: Backyard in Northern Illinois
Time: 07:30 PM EDT
Your letter to the bugman: What is it? I think I’ve seen a green one on my sidewalk 3 yrs ago.
How you want your letter signed: LikesBugsNot
The orange color on this Imperial Moth Caterpillar indicates it is pre-pupal, and it has left the tree or shrub upon which it was feeding in order to find an appropriate place to pupate.