Birdwing
Birdwings are butterflies in the swallowtail family, that belong to the genera "Trogonoptera", "Troides", and "Ornithoptera". Most recent authorities recognise 36 species, however, this is debated, and some authorities include additional genera. Birdwings are named for their exceptional size, angular wings, and birdlike flight. They are found across tropical Asia, mainland and archipelagic Southeast Asia, and Australasia. Included among the birdwings are some of the largest butterflies in the world: the largest, Queen Alexandra's birdwing; the second largest, the Goliath birdwing; the largest butterfly endemic to Australia, the Cairns birdwing; and the largest butterfly in India, the southern  birdwing. Another well-known species is Rajah Brooke's birdwing, a particularly attractive species named after Sir James Brooke, the first White Rajah of 19th-century Sarawak. Due to their size and brightly coloured males, they are popular among collectors of butterflies, but all birdwings are now listed by CITES, thereby limiting (and in the case of "O. alexandrae" completely banning) international trade. Taxonomy. Genera and species. genus: "Troides" genus: "Trogonoptera" genus: "Ornithoptera" Description. Ova. After mating, females immediately begin to seek appropriate host plants; climbing vines of the genera "Aristolochia" and "Pararistolochia" (both in the family Aristolochiaceae) are sought  exclusively. The female lays her spherical eggs under the tips of the vine's leaves, one egg per leaf. Larva. The caterpillars are voracious eaters but move very little; a small group will defoliate an entire vine. If starved due to overcrowding, the caterpillars may resort to cannibalism. Fleshy spine-like tubercles line the caterpillars' backs, and their bodies are dark red to brown and velvety black. Some species have tubercles of contrasting colours, often red, or pale "saddle" markings. Like other members of their family, birdwing caterpillars possess a retractable organ behind their heads called an "osmeterium". Shaped like  the forked tongue of a snake, the osmeterium excretes a fetid terpene-based compound and is deployed when the caterpillar is provoked. The caterpillars are also unappealing to most predators due to their toxicity: the vines which the caterpillars feed upon contain aristolochic acid, a poisonous compound known to be carcinogenic in rats. The feeding caterpillars incorporate and concentrate the aristolochic acid into their tissues, where the poison will persist through metamorphosis and into adulthood. Pupa. Birdwing chrysalids are camouflaged to look like a dead leaf or twig. Before pupating, the caterpillars may wander considerable distances from their host plants . In "O. alexandrae", it takes about four months to get from egg to adult. Barring predation, this species can also survive up to three months as an adult. Imago. Birdwings inhabit rainforests and adults are usually glimpsed along the forest periphery. They feed upon—and are important long-range pollinators of—nectar-bearing flowers of the forest canopy, as well as terrestrial flowers, such as lantana. They are strong flyers and seek sunlit spots in which to bask. Breeding behaviour varies little between species; the female's role is relatively passive, slowly fluttering from perch to perch while the male  performs an elaborate, quivering yet stationary dance 20–50 cm above her. Birdwings are typified by large size (up to a maximum body length of 7.6 cm or 3 inches and a wingspan of 28 cm or 11 inches in "O. alexandrae"), showy colouration (in contrasting shades of green, yellow, black, white, and sometimes blue or orange), and slender, lanceolate forewings. With few exceptions (i.e., the New Guinean "O. meridionalis" and "O. paradisea"), the hindwings lack tails. Sexual dimorphism is strong in "Ornithoptera" species only, where males are black combined with bright iridescent green, blue, orange, or yellow while the larger  and less colourful females are overall black or dark brownish with white, pale brown, or yellow markings. Males and females of most "Troides" birdwings are similar and have jet black to brown dorsal forewings, often with the veins bordered in grey to creamy white. At least one of these darkly-coloured species ("T. rhadamantus") possesses thermoreceptors on the anal veins (A2 and A3) of the wings and on the antennal clubs. The antennal receptors of the clubs—which also possess hygroreceptors that measure atmospheric humidity—are known as "sensilla basiconica". The thermoreceptors are sensitive to sudden increases in temperature; they  are thought to help the butterfly thermoregulate and avoid overheating while basking. The colours of most species are pigmentary (via papiliochrome); but two species, "Troides magellanus" and the much rarer "T. prattorum", are noted for their use of limited-view iridescence: the yellow of the dorsal hindwings is modified by bright blue-green iridescence which is only seen when the butterfly is viewed at a narrow, oblique angle. This "grazing iridescence" is brought about through diffraction of light (after back-reflection) by the wings' extremely steeply-set, multilayered rib-like scales (rather than the ridge-lamellae of most other iridescent  butterflies, such as "Morpho" species). Such limited-view iridescence was previously only known from one other species, the riodinid "Ancyluris meliboeus". In "A. meliboeus", however, the iridescence is produced by ridge-lamellar scales and features a wider range of colours. The close evolutionary relationship between "Troides" and "Ornithoptera" butterflies is well demonstrated by the fact that commercial breeders have produced numerous hybrids between the two. The final and smallest genus is "Trogonoptera" with just two species. They resemble each other, being overall black with iridescent green markings and a red head. Females are duller than males. Distribution. Birdwings are generally  found from Southeast Asia to northern Australasia. "Trogonoptera brookiana" inhabits the Thai-Malay Peninsula, Borneo, Natuna, Sumatra, and various surrounding islands. "Trogonoptera trojana" is endemic to Palawan in the Philippines. "Troides" species are distributed widely across the Indomalayan realm, but may be found as far east as New Guinea in the case of "Troides oblongomaculatus". Some species may be found as far west as India, and are the westernmost distributed of all birdwings. All "Ornithoptera" species are found in the northern portion of the Australasian realm, east of Weber's line; the Moluccas, New Guinea, the Solomon Islands, and northeastern  Australia. An outlier is "Ornithoptera richmondia", which may be found in far northeastern New South Wales, Australia in the southernmost area of its range; the southernmost distribution of all birdwings. Status and protection. With the exception of Queen Alexandra's birdwing ("O. alexandrae"), all birdwings are listed in Appendix II of CITES, and accordingly their trade is restricted in countries that have signed the CITES convention. Exceptions are made for captive-reared specimens, which mainly originate from ranches in Papua New Guinea and Indonesia. Most species of all three genera have now been reared in captivity, though with significant differences  in the quantities reared of each species. "O. alexandrae" is listed on Appendix I and therefore cannot legally be traded internationally. At the 2006 meeting of the CITES Animals Committee some suggested "O. alexandrae" should be moved to Appendix II, as the conservation benefits of sustainable management perhaps are higher than those of the trade ban. Three "Troides" and eight "Ornithoptera" species have been given assessments by the IUCN Red List, with classifications ranging from "least concern" to "endangered". Richmond birdwings ("O. richmondia") depend on the plant "Aristolochia praevenosa" which they need for their caterpillars. However, the very similar  Aristolochia elegans (Dutchman's pipe) which can be found in many Australian backyards, kills the caterpillars. Reproduction. "Ornithoptera", or the genus of birdwing butterflies, usually reproduce sexually and are oviparous. In butterflies sex is determined by a WW/WZ system, with a heterogametic female, reverse of that found in mammals and many other insects, which have a heterogametic male. During copulation males will transfer an ejaculate containing both sperm and accessory substances that can make up to fifteen percent of a males body mass. Mating systems. Mating systems, first explored in evolutionary terms by Darwin, includes all behaviours associated with  sexual reproduction. Mating systems include all costs and benefits, pre- and postcopulatory competitions, displays and mate choice. Butterfly mating systems have great variation, including strict monandry, one male and one female, to polyandry, having many mates of the opposite sex. Typically "Ornithoptera" tend to be polygamous, mating with more than one individual. Female choice. Female choice can have a serious impact on mate selection and successful reproduction. Several species of "Ornithoptera" have been known to create hybrids if they have no access to their own species. "Troides oblongamaculatus" females have been known to choose to mate with other species such  as "Ornithoptera priamus poseidon", which will attempt mating if their own species is not to be found near by. The females will typically resist mating attempts by covering their abdomen with their forewings or dropping to the ground, making mating near impossible. Although the females usually resist these mating attempts, they have been noted to be more susceptible if they have not had previous encounters with males of their own species. Male courtship. Some male "Ornithoptera" species demonstrate courtship behaviour. "Ornithoptera priamus posedion" males will approach a female carefully, and examine the female for several minutes. After consideration, the male  may choose to hover twenty to thirty centimeters above the female, displaying the bright yellow marking on its hindwings. Meanwhile, the forewings will move forward, exposing the abdomen and androconial hair tufts. Mating is only attempted when the female has ceased to flap her wings. After about thirty seconds of the display, the male will attempt copulation. Cryptic choice: sperm competition and postcopulatory guarding. In many animals, females often mate with more than one male. Males who are able will adapt strategies such as postcopulatory guarding to ensure the paternity of the offspring. Following insemination, it is common for the  male "Ornithoptera" to produce a mating plug, which will seal the ostium bursae and prevent remating by the female, as new sperm is unable to enter the opening. The plug does not impede oviposition and may stay in place for the duration of the female's life. Sexual dimorphism. Sexual dimorphism is very prominent in "Ornithoptera" species, the males being black with brightly colored markings of blue, green, orange or yellow and the females are overall black or dark brown. The sexual dichromatism functions in mate recognition by the use of photoreceptors. Due to the protected nature of "Ornithoptera" it  has been difficult to study the spectral sensitivities of the sexes although this difference in coloration alludes to the idea of sensory exploitation of the female's photoreceptors. The sensory bias of females to select for males with brighter wings has yet to be studied in "Ornithoptera". Gyanandromorphism is a very rare condition in which an organism simultaneously expresses both male and female phenotypes. It is only observed in species that express strong sexual dimorphism. Gynandromorphs are suspected to be due to genetic errors associated with cell division such as nondisjunction, as well as fertilization of binucleate ova and fertilisation  of multiple sperm that may fuse and act as a second nucleus. "Ornithoptera" is known to commonly exhibit this phenomenon, but little to no research has been successful in determining why. Those who experience this phenomenon, usually females, show male-pigmented tissues on their wings.