Parakeet
Overview
 
Parakeet is a term for any one of a large number of unrelated small to medium sized species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of parrot
Parrot
Parrots, also known as psittacines , are birds of the roughly 372 species in 86 genera that make up the order Psittaciformes, found in most tropical and subtropical regions. The order is subdivided into three families: the Psittacidae , the Cacatuidae and the Strigopidae...

, that generally have long tail feather
Feather
Feathers are one of the epidermal growths that form the distinctive outer covering, or plumage, on birds and some non-avian theropod dinosaurs. They are considered the most complex integumentary structures found in vertebrates, and indeed a premier example of a complex evolutionary novelty. They...

s. Older spellings still sometimes encountered are paroquet or paraquet.
The term Grass Parakeet (or Grasskeet) refers to a large number of small Australian parakeets native to grasslands such as Neophema
Neophema
The genus Neophema is an Australian genus of broad-tailed parrots with six or seven species. They are small parakeets with a more or less dull green basic color with some contrasting colorful patches, and are commonly known as grass parrots...

 and Princess Parrot
Princess Parrot
The colourful Princess Parrot, Polytelis alexandrae, is an Australian bird of the parrot family. Its name was given in honour of Princess Alexandra of Denmark, who later married the Prince of Wales Edward VII and eventually became the Queen of England...

. The Australian rosella
Rosella
A rosella is one of five to eight species of colorful Australian parrots in the genus Platycercus. Platycercus means "broad-tailed" or "flat-tailed", reflecting a feature common to the rosellas and other members of the broad-tailed parrot tribe...

s are also parakeets.
 
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