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Papilio polytes
Black swallowtail butterfly with orange and white highlights on the rear wings - orange spots around/just inside the edge with white spots clustered in the center. The front wings have black, patterned lines with white shading around them.
Spotted just inland from the shore on the Thai island of Koh Chang. The air was hot and humid.
Its female Common Mormon, the host plants are cultivated and wild citrus.