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http://nsf.gov/news/news_summ.jsp?cntn_id=121306&org=NSF&from=news

A yellow form of the female eastern tiger swallowtail butterfly
(Credit: K. Kunte, Harvard University)

“Appalachian tiger swallowtail butterfly is hybrid of other swallowtails.”

Research on these butterflies could be increasing our knowledge of species formation.

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