Hanging parrot

Hanging parrots are birds in the genus Loriculus, a group of small parrots from tropical southern Asia.

About 13 cm long, hanging parrots are mostly green plumaged and short-tailed. Often head coloring helps to identify individual species. They are unique among birds for their ability to sleep upside down.

Taxonomy
The genus Loriculus was introduced in 1849 by the English zoologist Edward Blyth for the blue-crowned hanging parrot. The name is a diminutive of the genus Lorius that was introduced by Nicholas Aylward Vigors for the lorys in 1825.

Fifteen species are recognised:
 * Vernal hanging parrot, Loriculus vernalis
 * Sri Lanka hanging parrot, Loriculus beryllinus
 * Philippine hanging parrot, Loriculus philippensis
 * Black-billed hanging parrot, Loriculus bonapartei
 * Camiguin hanging parrot, Loriculus camiguinensis (first described in 2006)
 * Blue-crowned hanging parrot, Loriculus galgulus
 * Great hanging parrot, Loriculus stigmatus (also known as the Celebes hanging parrot)
 * Moluccan hanging parrot, Loriculus amabilis
 * Sula hanging parrot, Loriculus sclateri (split from L. amabilis)
 * Sangihe hanging parrot, Loriculus catamene
 * Orange-fronted hanging parrot, Loriculus aurantiifrons
 * Bismarck hanging parrot, Loriculus tener
 * Pygmy hanging parrot, Loriculus exilis (also known as the green hanging parrot)
 * Yellow-throated hanging parrot, Loriculus pusillus
 * Wallace's hanging parrot, Loriculus flosculus