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Rainbow lorikeet pairs defend their feeding and nesting areas aggressively against other rainbow lorikeets and other bird species. Rainbow lorikeets often travel together in pairs and occasionally respond to calls to fly as a flock, then disperse again into pairs. Males and females look identical, and surgical sexing by a vet or DNA analysis of a feather is used to determine the sex of an individual. Unlike the eclectus parrot, rainbow lorikeets do not have any immediately discernible dimorphic traits. The markings of Trichoglossus moluccanus resemble those of the coconut lorikeet ( Trichoglossus haematodus), but with a blue belly and a more orange breast with little or no blue-black barring. Juveniles have a black beak, which gradually brightens to orange in the adults. There is little to visually distinguish between the sexes. In flight a yellow wing-bar contrasts clearly with the red underwing coverts. The belly is deep blue, and the thighs and rump are green. The head is deep blue with a greenish-yellow nuchal collar, and the rest of the upper parts (wings, back and tail) are green. The plumage of the nominate race, as with all subspecies, is very bright and colorful.
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The rainbow lorikeet is a medium-sized parrot, with the length ranging from 25 to 30 cm (9.8 to 11.8 in) including the tail, and the weight varies from 75 to 157 g (2.6–5.5 oz). The specimens came to the Liverpool national collection via purchase from H. The specimens were collected in Cooktown, Queensland, Australia by E. Liverpool Mus., 2, 1900, p.115) are held in the vertebrate zoology collection of National Museums Liverpool at World Museum, with accession numbers NML-VZ. Three syntypes of Trichoglossus novaehollandiae septentrionalis Robinson ( Bull. 4b) held at World Museum, National Museums Liverpool Syntypes of Trichoglossus novaehollandiae septentrionalis Robinson (NML-VZ. In 2019 The rainbow lorikeet in Australia was split into three: rainbow, coconut ( Trichoglossus haematodus) and red-collared lorikeets ( Trichoglossus rubritorquis). This is increasingly followed by major authorities. capistratus) and the Flores lorikeet ( T.
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Additionally, a review in 1997 led to the recommendation of splitting off some of the most distinctive taxa from the Lesser Sundas as separate species, these being the scarlet-breasted lorikeet ( T. rubritorquis) as a subspecies, but today most major authorities consider it separate. The rainbow lorikeet has often included the red-collared lorikeet ( T. moluccanus (Gmelin, JF, 1788) – Australia (except Cape York Peninsula) and Tasmania septentrionalis Robinson, 1900 – Cape York Peninsula (northeast Australia) The rainbow lorikeet is now placed in the genus Trichoglossus that was introduced in 1826 by the English naturalist James Francis Stephens. The type locality was changed to Botany Bay in Australia by Gregory Mathews in 1916. Gmelin was misled and coined the specific epithet moluccanus as he believed the specimens had come from the Moluccas. The species was illustrated as the "Peluche des Moluques" and as the "Perruche d'Amboine". Gmelin cited the French polymath Georges-Louis Leclerc, Comte de Buffon who in 1779 had published a description of "La Perruche à Face Bleu" in his Histoire Naturelle des Oiseaux. The rainbow lorikeet was formally listed in 1788 by the German naturalist Johann Friedrich Gmelin under the binomial name Psittacus moluccanus.