Poicephalus rufiventris

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Psittaciformes

Familia: Psittacidae
Subfamilia: Psittacinae
Tribus: Psittacini
Genus: Poicephalus
Species: Poicephalus rufiventris
Name

Poicephalus rufiventris (Rüppell, 1845)
Vernacular names
Deutsch: Rotbauchpapagei
English: Red-bellied Parrot
français: Perroquet à ventre rouge
References

Systemat. Uebers. Vog. N.-O.-Afr.: 83, pl.32

The red-bellied parrot (Poicephalus rufiventris) is a small African parrot about 23 cm (9 in) long of the genus Poicephalus. It is a mostly greenish and grey parrot. Males have a bright orange belly and females have a greenish belly.
Description
A juvenile male stretching. Note dark irises typical of juveniles.

The red-bellied parrot is a small parrot about 23 cm (9 in) long and weights 140 g (5 oz). It is a mostly greenish and grey bird with the green being more prominent over its lower surfaces and the grey more prominent over its upper surfaces. Adult birds have green feathers covering the upper portions of their legs, red irises and dark grey beaks. The species is sexually dimorphic; Typically, males have a bright orange lower chest and abdomen, whilst adult females are greenish on these lower areas. The dimorphism occurs from a young age and is seen even in young chicks still in the nest.[2]

Although the name red-bellied parrot implies that the parrot has hints of red, the word for the color orange was not introduced into the English language until after the fruit orange was discovered and named, so some animals which are colored orange by our current definition were named red due to the fact that a word for the color orange didn't exist in English.
Breeding
A pair of red-bellied parrots in the Samburu National Reserve, Kenya. The male (outside) has built a nest for the female (inside)

The red-bellied parrot nests in tree cavities. The eggs are white and there are usually three in a clutch. The female incubates the eggs for about 28 days and the chicks leave the nest about 63 days after hatching.[2]
References

BirdLife International (2016). "Poicephalus rufiventris". IUCN Red List of Threatened Species. 2016: e.T22685312A93067459. doi:10.2305/IUCN.UK.2016-3.RLTS.T22685312A93067459.en.
Alderton, David (2003). The Ultimate Encyclopedia of Caged and Aviary Birds. London, England: Hermes House. p. 224. ISBN 1-84309-164-X.