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Silkworm or Moth? - Hyalophora cecropia

Silkworm or Moth? - Hyalophora cecropia
Rising Sun, Indiana, Indiana, USA
June 11, 2010
Size: large
I saw this resting on top of a golf cart. At first, I thought it was fake until the wings moved. Is this a moth or a silkworm?

Moved from ID Request.

As Jody noted, it's not the greatest angle...
Just a guess from looking at the patterns just behind the head:

(click to enlarge)

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This certainly is a cecropia.

A silkworm is just a larvae of certain types of moths
this is a male giant silkmoth but i dont think you'll get any more of a id from this pic.

No, it's a larva. Larvae is plural.

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