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Photo#283640
Big yellow butterfly - Papilio canadensis - female

Big yellow butterfly - Papilio canadensis - Female
Watertown, Middlesex County, Massachusetts, USA
May 31, 2009
I've been seeing these guys swooping around for the last few weeks. Finally one held still. Its body seems really fat for a butterfly. Could it be a moth?

Canadian Tiger Swallowtail
Papilio canadensis, a female.

butterfly
I believe you have a photo of an Eastern Tiger Swallowtail

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