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Loriculus, or hanging parrots, is a genus of small parrots in the family Psittaculidae.
The name is a diminutive of the genus Lorius.

1/ Vernal hanging parrot (Vẹt lùn, Loriculus vernalis)

The family Psittacidae or holotropical parrots is one of three families of true parrots. 
The name 'Psittaciformes' comes from the ancient Greek for parrot, 'Psittacus', whose origin is unclear.

Psittaciformes:
- Strigopidae – New Zealand parrots (4 species)
- Cacatuidae – Cockatoos (22 species)
- Psittacidae – African and New World parrots (179 species)
- Psittaculidae – Old World parrots (203 species)

Parrots (Psittaciformes), also known as psittacines, are birds with a strong curved beak, upright stance, and clawed feet.
The name 'Psittaciformes' comes from the ancient Greek for parrot, 'Psittacus', whose origin is unclear.

Psittaciformes:
- Strigopidae – New Zealand parrots (4 species)
- Cacatuidae – Cockatoos (22 species)
- Psittacidae – African and New World parrots (179 species)
- Psittaculidae – Old World parrots (203 species)

Members of the parrot genus Psittacula or Afro-Asian ring-necked parrots, as they are commonly known in aviculture, originate from Africa to South-East Asia. The name of the genus is a diminutive of the Latin word psittacus for a "parrot".

1/ Rose-ringed parakeet (Psittacula krameri), also known as the ringneck parrot (in aviculture) or the Kramer parrot
 the specific krameri commemorates the Austrian naturalist Wilhelm Heinrich Kramer.

2/ Blossom-headed parakeet (Vẹt đầu hồng, Psittacula roseata)

3/ Slaty-headed parakeet (Vẹt đầu xám, Psittacula himalayana)

4/ Long-tailed parakeet (Vẹt đuôi dài, Psittacula longicauda)
The specific epithet longicauda combines the Latin longus meaning "long" and cauda meaning "tail".

5/ Alexandrine parakeet (Vẹt má vàng, Psittacula eupatria), also known as the Alexandrine parrot
named after Alexander the Great.
The specific name eupatria is derived from the Ancient Greek words eu- meaning "well" and patria meaning "descent".

6/ Red-breasted parakeet (Vẹt ngực đỏ, Psittacula alexandri) 
The specific epithet alexandri is from Alexander the Great whose soldiers introduced parakeets to Greece.

Psittaculidae is a family containing Old World parrots. It consists of six subfamilies: Psittrichasinae, Agapornithinae, Loriinae, Platycercinae, Psittacellinae and Psittaculinae.

The name 'Psittaciformes' comes from the ancient Greek for parrot, ψιττακός ('Psittacus'), whose origin is unclear.
The genus name Psittacula is a diminutive of the Latin word psittacus meaning "parrot".

Psittaciformes:
- Strigopidae – New Zealand parrots (4 species)
- Cacatuidae – Cockatoos (22 species)
- Psittacidae – African and New World parrots (179 species)
- Psittaculidae – Old World parrots (203 species)