The Kaiser-i-Hind (Teinopalpus imperialis) is a rare species of swallowtail butterfly found from Nepal and north India east to north Vietnam. The common name literally means "Emperor of India". The Kaiser-i-hind is much sought after by butterfly collectors for its beauty and rarity. The green iridiscence of the wings has been found to be due to three dimensional photonic structure of the scales and is the subject of much research.
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