Although there are a few exceptions, parrots are monogamous breeders which nest in cavities and hold no territories other than their nesting sites. The pair bonds of the parrots and cockatoos are strong and the pair will remain close even during the non-breeding season, even if they join larger flocks.

As with many birds pair bond formation is preceded by courtship displays; these are relatively simple in the case of cockatoos.

In Psittacidae parrots common breeding displays, usually undertaken by the male, include slow deliberate steps known as a "parade" or "stately walk" and the "eye-blaze", where the pupil of the eye constricts to reveal the edge of the iris.

Allopreening is used by the pair to help maintain the bond. Cooperative breeding, where birds other than the breeding pair help the pair raise the young and is common in some bird families, is extremely rare in parrots, and has only unambiguously been demonstrated in the Golden Parakeet (which may also exhibit polyamorous or group breeding system with multiple females contributing to the clutch).


Only the Monk Parakeet and five species of Agapornis lovebird build nests in trees, and three Australian and New Zealand ground parrots nest on the ground.

All other parrots and cockatoos nest in cavities, either tree hollows or cavities dug into cliffs, banks or the ground. The use of holes in cliffs is more common in the Americas. many species will use termite nests, possibly as it reduces the conspicuousness of the nesting site or because it creates favourable microclimates.

In most cases both species will participate in the nest excavation. The length of the burrow varies with species, but is usually between 0.5–2 m in length. The nests of cockatoos are often lined with sticks, wood chips and other plant material. In the larger species of parrot and cockatoo the availability of nesting holes can be limited and this can lead to intense competition for them both within the species and between species, as well as with other bird families.

The intensity of this competition can limit breeding success in some cases. Some species are colonial, with the Burrowing Parrot nesting in colonies up to 70,000 strong. Coloniality is not as common in parrots as might be expected, possibly because most species adopt old cavities rather that excavate their own.

There are numerous difficulties in studying wild parrots, as they are difficult to catch and once caught they are difficult to mark. Most wild bird studies rely on rings (or bands) or some form of wing tag, but parrots will chew them off.


The parrots also tend to range widely and as a consequence there are many gaps in science's knowledge of their behavior. Parrots have a strong, direct flight. Most species spend most of their time perched or climbing in tree canopies. They often use their bills for climbing by gripping or hooking on branches and other supports. On the ground parrots often walk with a rolling gait.

The diet of parrots consists of seeds, fruit, nectar, pollen, buds, and sometimes insects and to a lesser degree animal prey. Without question the most important of these to most true parrots and cockatoos are seeds.

The evolution of the large and powerful bill can be explained primarily as an adaptation to opening and consuming seeds. All true parrots except the Pesquet's Parrot employ the same method to obtain the seed from the husk; the seed is held between the mandibles and the lower mandible crushes the husk, whereupon the seed is rotated in the bill and the remaining husk is removed.

A foot is sometimes used to help holding large seeds in place. Parrots are seed predators rather than seed dispersers; and in many cases where species are recorded as consuming fruit they are only eating the fruit to get at the seed. As seeds often have poisons to protect them, parrots are careful to remove seed coats and other fruit parts which are chemically well defended, prior to ingestion.

Many species in the Americas, Africa, and Papua New Guinea consume clay which both releases minerals and absorbs toxic compounds from the gut. Parrots at a clay lick in Ecuador. Consuming clay neutralises toxins in the diet. The lories and lorikeets, Swift Parrot and Philippine Hanging Parrot are primarily nectar and pollen consumers, and have tongues with brush tips to collect this source of food, as well as some specialized gut adaptations to accommodate this diet.

Many other species also consume nectar as well when it becomes available. In addition to feeding on seeds and flowers, some parrot species will prey on animals. Golden-winged Parakeets prey on water snails, and famously the Keas of New Zealand will scavenge on sheep carcases and even kill juvenile petrels.

Another New Zealand parrot, the Antipodes Island Parakeet, enters the burrows of nesting Grey-backed Storm-petrels and kills the incubating adults. Some cockatoos and the Kākā will also excavate branches and wood to obtain grubs.

Extant species range in size from the Buff-faced Pygmy Parrot, at under 10 g (0.35 oz.) in weight and 8 cm (3.2 inches) in length, to the Hyacinth Macaw, at 1.0 meter (3.3 feet) in length, and the Kakapo, at 4.0 kg (8.8 lbs) in weight.


Amongst the families, the three Nestoridae species are all large parrots, and the cockatoos tend to be large birds as well. The Psittacidae parrots are far more variable, ranging the full spectrum of sizes shown by the family. The most obvious physical characteristic that characterises parrots is their strong, curved, broad bill.

The upper mandible is prominent, curves downward, and comes to a point. It is not fused to the skull, which allows it to move independently, and contributes to the tremendous biting pressure these birds are able to exert. The lower mandible is shorter, with a sharp, upward facing cutting edge, which moves against the flat portion of the upper mandible in an anvil-like fashion.

Seed eating parrots have a strong tongue which helps to manipulate seeds or position nuts in the bill so that the mandibles can apply an appropriate cracking force. The head is large, with eyes positioned sideways, which limits binocular vision, but greatly enhances peripheral vision. Cockatoo species have a mobile crest of feathers on the top of their heads which can be raised for display, and retracted.

No other parrots can do so, but the Pacific lorikeets in the genera Vini and Phigys are able to ruffle the feathers of the crown and nape. The predominant colour of plumage in parrots is green, though most species have some red or another colour in small quantities.

Cockatoos are the main exception to this, having lost the green and blue plumage colours in their evolutionary history they are now predominately black or white with some red, pink or yellow. Strong sexual dimorphism in plumage is not typical amongst the parrots, with some notable exceptions, the most striking being the Eclectus Parrot.

Parrots are found on all tropical and subtropical continents including Australia and the islands of the Pacific Ocean, South Asia, southeast Asia, southern regions of North America, South America and Africa.


Some Caribbean and Pacific islands are home to endemic species. By far the greatest number of parrot species come from Australasia and South America. The lories and lorikeets range from Sulawesi and the Philippines in the north to Australia and across the Pacific as far as French Polynesia, with the greatest diversity being found in and around New Guinea.

The subfamily Arinae encompasses all the Neotropical parrots, including the Amazons, macaws and conures, and range from northern Mexico and the Bahamas to Tierra del Fuego in the southern tip of South America.

The pygmy parrots, subfamily Micropsittinae, are a small genus restricted to New Guinea. The subfamily Nestorinae are three species of aberrant parrots from New Zealand. The broad-tailed parrots, subfamily Platycercinae, are restricted to Australia, New Zealand and Pacific islands as far as Fiji. The final true parrot subfamily, Psittacinae, includes a range of species from Australia and New Guinea to the species found in South Asia and Africa.

The centre of cockatoo biodiversity is Australia and New Guinea, although some species reach the Solomon Islands (and one species formerly occurred in New Caledonia), Indonesia and the Philippines.

Several parrot species enter the cool, temperate regions of South America and New Zealand. One species, the Carolina Parakeet existed in temperate North America, but was hunted to extinction in the early 20th century. Numerous species have been introduced in areas with temperate climates, and have established stable populations in several states of the USA, the United Kingdom and Spain.

While a few parrot species are wholly sedentary or fully migratory, the majority fall somewhere between the two, making poorly understood regional movements, some species adopting an entirely nomadic lifestyle.