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The Common Buckeye or simply Buckeye (Junonia coenia) is a butterfly in the family Nymphalidae. It is found in southern Manitoba, Ontario, Quebec, and Nova Scotia and all parts of the United States except the northwest, and is especially common in the south, the California coast, and throughout Central America and Colombia. The sub-species Junonia coenia bergi is endemic to the island of Bermuda. The bold pattern of eyespots and white bars on the upper wing surface is distinctive in much of its range, though compare related species in the same genus. These are Mangrove Buckeye (Junonia evarete) and Tropical Buckeye (Junonia genoveva), formerly considered one species, and the Smoky Buckeye (Junonia evarete). The eyespots likely serve to startle or distract predators, especially young birds. The species has many flights throughout the year, with mostly northward migrations for the summer. Much of the northern United States is only colonized in the fall from southern populations. Some of the later broods move southwards in the fall. Common Buckeyes exhibit seasonal polyphenism, the summer version of the butterfly has light yellowish ventral wings and is called "linea". The Fall morph has pink ventral wings, and is called the "rosa" morph
Its habitat is open areas with low vegetation and some bare ground.