The Baltimore checkerspot (Euphydryas phaeton) is a North American butterfly of the family Nymphalidae. It has been the official state insect of the U.S. State of Maryland since 1973. The Baltimore checkerspot was named for the first Lord Baltimore due to its similarity of colors in the family crest. Despite the species status as Maryland state insect, the population in Maryland has faced significant decline and is currently listed by the Maryland Department of Natural Resources as "rare, threatened, and endangered" animal list.

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