Lepidopterists rejoice! It's the birdwing butterfly. The scientific name given here is Troides magellanus, the Magellan birdwing, which matches the vibrant orange and black picture, but the subscript calls it the common birdwing, Troides Helena. This seems like an error to me. The beautiful Magellan birdwing butterfly is native to the Philippines, as is this stamp, whereas the common birdwing lives throughout the Indian subcontinent and the Indonesian archipelago. Start a raging debate amongst your butterfly collecting friends with this unusual butterfly t-shirt.