Pre-pupal Luna Moth Caterpillar

Subject:  is this a luna caterpillar?
Geographic location of the bug:  Athens, Georgia
Your letter to the bugman:  This looks like a luna moth caterpillar but it’s orange, not green ?? Found crawling up my window screen Sept 2017, in wooded suburban-rural area.
How you want your letter signed:  curious about color

Pre-Pupal Luna Moth Caterpillar

Dear curious about color,
Many caterpillars change color just prior to pupation.  We agree that this is a Luna Moth Caterpillar and it is about to spin a cocoon and pupate.  See this BugGuide image.

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