Birdwings are large, tropical papilionid butterflies native to mainland and archipelagic Southeast Asia and Australasia (with one Indian species), and are usually regarded as belonging to three genera: Ornithoptera, Trogonoptera and Troides. Other genera are recognised by some authorities, with a species count ranging from ca. 10–30. Birdwings are named for their exceptional size, angular wings, and birdlike flight.