Geographic location of the bug: Northern Ontario
Time: 08:10 AM EDT
Your letter to the bugman: Have searched a bit but not confident about what type this is.
Possibly an imperial?
How you want your letter signed: Cindy
This is indeed an Imperial Moth Caterpillar, and its darker coloration indicates it is getting ready to pupate. Caterpillars will frequently change color and leave the host plant when it is time to pupate, so we are guessing it was found on the ground as Imperial Moth Caterpillars pupate underground.