From: Butterflies Coloring Book
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Question Mark (Polygonia interrogationis). A silvery question mark on the underside of its mottled hind wings gives this member of the Anglewing group of the Brushfooted Butterflies its name. The edges of its wings look ragged and often have a purple hue. Able to lay its eggs in any number of trees, particularly elms, the Question Mark is able to thrive in many places east of the Rocky Mountains, from Canada to Mexico. The adults frequently feed on fermented fruit, leading sometimes to the butterflies' becoming intoxicated!
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