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Eastern Tiger or Black Swallowtail Butterfly? - Papilio glaucus - female

Eastern Tiger or Black Swallowtail Butterfly? - Papilio glaucus - Female
Mountain hardwood forest area between Lake Lure and Old Fort, Old Fort County, North Carolina, USA
March 19, 2011
Size: a couple of inches
Is this an Eastern Tiger or Black Swallowtail Butterfly? How can you tell the difference. What about the differences between male and female? Plus, they have a habit of not staying still too long! Thank you.

Thank you Corey
Corey, thanks for the id. I contribute a nature column to a local newsletter and don't want to make an identificaiton mistake. I appreciate your help and knowledge. Marcy

Moved from ID Request. Those yellowish "comma" marks are a good indicator that this is a dark female Eastern Tiger. Also, Black Swallowtail females often have a another row of yellow dots (often pale) on the inside of the blue area.

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