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Unknown Moth/Butterfly - Hyalophora cecropia

Unknown Moth/Butterfly - Hyalophora cecropia
Cincinnati, Hamilton County, Ohio, USA
June 13, 2011
I don't know if this is a moth of butterfly. It appeares to have recently emerged from a large cocoon very near where it was hanging onto the tree trunk. It was very slowly moving its wings open and closed virtually all of the day today. It didn't open its wings all the way because a vine restricted a full extension, but the wing span was at least 8 inches and the head to tail length was about 4 1/2 inches. I'm clearly not an entomologist, but was curious as to the identity of this moth/bitterfly since I have never seen one so large.

Moved from ID Request.

its crecropia i think its female.
and..if you keep an eye out in the morning...there will probably be a male there with her. she'll sit around there and scent and the males will fly to her

A Silkmoth
One of the Hyalophora, I believe Cecropia. An expert will tell you which one.

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