Hanging parrots are birds in the genus Loriculus, a group of small
parrots from tropical southern
Asia.
About 13 cm (5.1 in) long, hanging parrots are mostly green plumaged and short-tailed. Often head coloring helps to identify individual species.[1] They are unique among birds for their ability to sleep upside down.[2]
^Alderton, David (2003). The Ultimate Encyclopedia of Caged and Aviary Birds. London, England: Hermes House. p. 214.
ISBN1-84309-164-X.
^Buckley, Francine G (1966). "Behaviour of the Blue-crowned Hanging Parrot Loriculus galgulus with comparative notes on the Vernal Hanging Parrot L. vernalis". Ibis. 110 (2): 145–164.
doi:
10.1111/j.1474-919X.1968.tb00438.x.