The Derbyan Parakeet (Psittacula derbiana), also known as Lord Derby's Parakeet, is a monotypic parrot species, which is confined to small pocket of moist evergreen forest in the hills of the Indian state of Arunachal Pradesh and the Chinese province on its border. The species suffers from poaching for the illegal wildlife trade and fetches a high price in the black market. It is perhaps the rarest of all species of Psittacula in mainland Asia. The adult male and female are easily distinguished because they have different feather and beak colours.
The name of this bird commemorates Edward Stanley, 13th Earl of Derby.
Derbyan parakeets feed on fruits, berries, seeds, and leaf buds, occasionally foraging in gardens and fields.
Description
Derbyan parakeets average 20 inches (50 centimeters) in length and are sexually dimorphic. They have a mostly green plumage over their dorsal surface (ie from behind), black lores and lower cheeks, a bluish-purple crown and pale yellow eyes. The throat, breast, abdomen and under-wing coverts are greyish blue to lavender. The thighs and vent area are yellowish green with blue edging on some of the feathers. The tail feathers are shades of green, some edged with blue. Male birds have a red upper mandible with a yellow tip, while the lower mandible is black. The females have an all-black beak.
Immature Derbyan Parakeets are duller in colour than the adults. Juvenile birds have green crowns, orange-red upper and lower mandible (beak), and their irises are dark and do not lighten until they reach maturity between two and three years of age.
Sexual dimorphism
Adult male
The adult male has a red upper mandible
Male
Adult female
A female pet in Tibet. The adult female has an all black beak.
A female pet in China
Reproduction
Juvenile playing with a bolt on a cage in Tibet. Juveniles have dark irises and both the upper and lower mandible are orange-red.
Breeding season usually begins between April and June. The female lays a clutch of two to four eggs (36.1x27.7 mm (1.42 x 1.09 ins) in nest holes of trees. The young hatch after an incubation period of about 23 days and will fledge after 8 to 9 weeks.
