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Black and yellow wings
Woodland areas
Found at unity park
I think this is either a Eastern Tiger Swallowtail, or a Two-tailed Swallowtail seeing the "tails" would give a better idea. Anyway here are the 2 species, maybe since you saw the actual butterfly you will be able to decide.
http://bugguide.net/node/view/491
http://bugguide.net/node/view/23914