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Moth on Oak tree - 5/25/2008.
Largest moth in the US. Absolutely beautiful! Here's a photo of what looks to be a male (larger and more feathery antennae as lori mentioned) from Indiana: http://www.projectnoah.org/spottings/505...
Judging by the antennae, that's probably the female. Males have larger and more feathery antennae.