Psittacus | |
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Grey parrot | |
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Timneh parrot | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Psittaciformes |
Family: | Psittacidae |
Subfamily: | Psittacinae |
Genus: | Psittacus Linnaeus, 1758 |
Type species | |
Psittacus erithacus (grey parrot) | |
Species | |
Psittacus is a genus of African grey parrots in the subfamily Psittacinae. It contains two species: the grey parrot (Psittacus erithacus) and the Timneh parrot (Psittacus timneh).
For many years, the grey parrot and Timneh parrot were classified as subspecies; the former as the nominate, the latter as P. e. timneh. However, in 2012 the taxa were recognized as separate species by BirdLife International on the basis of genetic, morphological, plumage and vocal differences. [1] [2]
These parrots are found in the primary and secondary rainforest of West and Central Africa. They are among the most intelligent birds in the world. They feed primarily on palm nuts, seeds, fruits, and leafy matter, but have also been observed eating snails. Their inclination and ability to mimic speech and other sounds have made them popular pets.
The genus Psittacus was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae . [3] The genus name is Latin for "parrot". [4] Linnaeus included all 37 of the then-known parrots in the genus and of these George Robert Gray designated the grey parrot (Psittacus erithacus) as the type species. [5] [6]
The genus now contains only two species: [7]
Some aviculturalists recognize third and fourth species, but these are not distinguishable in scientific studies. [11]
Grey parrots are monogamous breeders which nests in tree cavities. The hen lays 3-5 eggs, which she incubates for 30 days while being fed by her mate. Young leave the nest at the age of 12 weeks. Little is known about the courtship behaviour of this species in the wild. [12]
Like many large parrots, greys are long-lived birds. The Animal Ageing and Longevity Database states the longest reliably recorded longevity for the species in captivity as 49.7 years. Also acknowledged are claims of captive grey parrots reaching the ages of 73 and 93, [13] whereas the World Parrot Trust lists a longevity of 50–60 years for a grey in captivity. [14] The Guinness Book of World Records listed a grey parrot that allegedly lived in captivity for 72 years as the longest-lived specimen for the species. [15]
The grey parrot (Psittacus erithacus) has been known at times to contract a non-infectious inflammatory lung disease called lipid pneumonia. Lipid pneumonia can be classified as exogenous or endogenous depending on whether or not the animal inhaled outside material. A necropsy shows that the lungs of a grey parrot with endogenous lipid pneumonia (EnLP) are firm with a diffuse grey discoloration. EnLP is a common illness in other animals as well. [16] The grey parrot is also one of the three parrots that scientists found to commonly suffer from dehydration. Scientists have used plasma osmolality to find more information about the form of dehydration grey parrots have. [17] Another disease that the grey parrots get is cardiomyopathy, which is a heart disease usually presented at a young age. The cause is having parents of the same breed. Some other common symptoms in these birds are weakness, coelomic cavity, and retardation. [18] The grey parrot has been known to contract beak and feather disease virus (BFDV) which causes a highly contagious, and sometimes fatal, psittacine beak and feather disease in parrots. [19] In a PCR-based study, Chlamydiosis, an infectious disease of avians, was found to infect the grey parrot. In the study 253 clinical samples were taken from 27 bird species belonging to seven orders. Thirty-two (12.6%) samples were positive for Chlamydi and two new genotypes were discovered: Chlamydophila psittaci and Chlamydophila abortus. [20] Another ailment that grey parrots commonly suffer from is hypocalcemic-induced seizure activity. Birds between 2–15 years of age contract it, due to a lack of calcium. A symptom of the syndrome can be unsteadiness while standing or falling off a perch along with neurological anomalies or problems. [21]
Birds appear to offer, in their behavior, neurophysiology, and neuroanatomy a striking case of parallel evolution of consciousness. Evidence of near human-like levels of consciousness has been most dramatically observed in African grey parrots.
Unlike other parrots, wild greys have been documented imitating the calls of several other species.[ citation needed ]
Irene Pepperberg's research with captive greys, most notably with a bird named Alex, has scientifically demonstrated that they possess the ability to associate simple human words with meanings, and to intelligently apply the abstract concepts of shape, colour, number, zero-sense, etc. According to Pepperberg and other ornithologists, they perform many cognitive tasks at the level of dolphins, chimpanzees, and even human toddlers. [23] As well as labeling objects, Alex could verbally express what his wants were, suggesting that grey parrots know the difference between features and feelings. [24] In general, it has been shown that grey parrots are able to learn relatively quickly, though they are limited to simple and non-abstract mediums of thinking. [25] They have been shown to be able to make cognitive inferences, but, like apes, have inter-individual differences in intelligence. For example, in one experiment involving food hidden under cups, it was shown that greys can identify where the food is, usually if shown its original location at first. [26]
Pet greys may learn to speak within their first year, but many don't say their first word until 12–18 months old. [27] Timnehs are generally observed to start speaking earlier, some in their late first year. [28] Both subspecies seem to have the same ability and tendency to produce human speech, but vocal ability and proclivity may range widely among individual birds. Grey parrots tend to use more specific calls for different species coming their way which can be known as stimulus specificity, since there is a stimulus vocalization the birds have. [29]
A study published in 2011, led by Dalila Bovet of Paris West University Nanterre La Défense, demonstrated grey parrots were able to coordinate and collaborate with each other to an extent. They were able to solve problems set by scientists—for example, two birds could pull strings at the same time to obtain food. In another example, one bird stood on a perch to release a food-laden tray, while the other pulled the tray out from the test apparatus. Both would then feed. The birds in question were observed waiting for their partners to perform the necessary actions so their behaviour could be synchronized. The parrots appeared to express individual preferences as to which of the other test birds they would work with. [30]
In an experiment about local enhancement in grey parrots, food was visibly hidden under two separate cups. The experimenter then lifted the first cup and either removed what was under it or put it back. This was then done again in several different combinations, the cups were lifted in a different order and the food was removed or put back in a different order. Instead of remembering which cup had the food, the birds would show preference to the one that was touched last. [31]
Another series of experiments further tested grey parrots' cognitive abilities. In general, most animals cannot associate sounds with objects, such as food, placed into a cup. While originally only the great apes and young human children were known to make this association with ease, it was found that grey parrots, under most conditions, can also associate sounds with the presence of an object. For the most part, grey parrots performed more successfully if the cup was shaken horizontally before it is given the choice of selecting which contained food; however, further experimentation indicated that it is not a requirement and proved that grey parrots have very high cognitive abilities. [32]
Wild grey parrots often whistle, click, or make other sounds. A grey's owner should expect to hear regular renditions of microwave ovens, telephones, alarm clocks, video games, and other electronic sounds, as well as dripping water, wild birds, and any other sound often heard by the parrot. Greys have even been known to repeat the profanity they heard from an owner even after they no longer live with that owner. Greys also have the ability to mimic, and distinguish between, the different voices they hear. Grey parrots use different alarm calls for different predators coming their way. [33]
In an experiment to test the vocalizations of grey parrots, four bred in captivity were placed in an aviary. Throughout the day they spent time in a room with toys and came into fairly regular contact with the humans taking care of them. The noises that these parrots could hear consisted of the calls of canaries in the laboratory, people cleaning, doors squeaking, etc. In the next 3 years, the parrots made over 50,000 vocalisations. What was interesting was that, although they were bred in captivity, the sounds they made were not only ones of their immediate surroundings. They also made calls similar to those of other captive grey parrots in different locations and even wild grey parrots. [34]
More rare than previously believed, the grey was uplisted from a species of least concern to near threatened in the 2007 IUCN Red List. [35] A recent analysis suggests up to 21% of the global population may be taken from the wild annually, [35] primarily for the pet trade. In 2012, the species was further uplisted to vulnerable. [10] The species is endemic to primary and secondary rainforests of West and Central Africa. [36] Grey parrots depend on large, old trees for the natural hollows they use for nesting. Studies in Guinea and Guinea-Bissau have found that greys' preferred species of nesting trees are also species preferred for timber. [37] The relationship between the status of the species and the status of primary forest is positive: [38] where the forests are declining, so too are populations of grey parrots. [37]
The grey parrot is listed on Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This requires both that exports be accompanied by a permit issued by a national authority and that a finding be made that the export is not detrimental to the species in the wild. With exports totaling more than 350,000 specimens from 1994 to 2003, [39] the grey parrot is one of the most heavily traded CITES-listed bird species. In response to continuing population declines, exceeded quotas, and unsustainable and illegal trade (including among range states), CITES included the grey parrot in Phase VI of the CITES Review of Significant Trade in 2004. This review has resulted in recommended zero export quotas for several range states and a CITES decision to develop regional management plans for the species.
In the United States, importation of wild-caught grey parrots is prohibited under the US Wild Bird Conservation Act of 1992. In the European Union, an EU Directive of 2007 prevents importation of this and any other wild-caught birds for the pet trade.
These intelligent mimics can make interesting pets and companion parrots. They have a devoted following among parrot owners. However, the same qualities mean they require a special commitment by their owners to provide frequent one-on-one interaction and supervised time out of their cages. They must be kept stimulated and busy by people and toys or they may become stressed and develop self-destructive behaviors. Greys require large cages, varied diets that include fresh foods, and plenty of safe and chewable toys. If not provided with these items, these parrots can quickly develop unpleasant behaviours and may eventually develop health problems (such as feather-plucking) that are difficult to remedy.
Even the healthiest, happiest pet parrot will generate a fair amount of mess and noise. Like most parrots, they are not domesticated, and even a well-socialized, hand-raised, aviary-bred bird is usually only one or two generations removed from its wild predecessor. Despite this, there is a long history of these parrots being kept at pets by the ancient Greeks, wealthy Roman families, King Henry VIII, Portuguese sailors, and others.
Amazon parrots are parrots in the genus Amazona. They are medium-sized, short-tailed parrots native to the Americas, with their range extending from South America to Mexico and the Caribbean. Amazona is one of the 92 genera of parrots that make up the order Psittaciformes and is in the family Psittacidae, one of three families of true parrots. It contains about thirty species. Most amazons are predominantly green, with accenting colors that depend on the species, and they can be quite vivid. They feed primarily on seeds, nuts, and fruits, supplemented by leafy matter.
The salmon-crested cockatoo, also known as the Moluccan cockatoo, is a cockatoo endemic to the Seram archipelago in eastern Indonesia. At a height of up to 46–52 centimetres (1.51–1.71 ft) and weight of up to 850 grams (1.87 lb), it is among the largest of the white cockatoos. The female is slightly smaller than the male on average. It has white-pink feathers with a definite peachy glow, a slight yellow on the underwing and underside of the tail feathers and a large retractable recumbent crest which it raises when threatened, revealing hitherto concealed bright red-orange plumes to frighten potential attackers. It may also be raised in excitement or in other 'emotional' displays. Some describe the crest as "flamingo-colored". It also has one of the louder calls in the parrot world and in captivity is a capable mimic.
The Senegal parrot is a parrot which is a resident breeder across a wide range of west Africa. It makes migrations within west Africa, according to the availability of the fruit, seeds and blossoms which make up its diet. It is considered a farm pest in Africa, often feeding on maize or millet. It is popular in aviculture.
The Alexandrine parakeet, also known as the Alexandrine parrot, is a medium-sized parrot in the genus Psittacula of the family Psittaculidae, native to South Asia and Southeast Asia. It is named after Alexander the Great, who transported numerous birds from Punjab to various European and Mediterranean countries and regions, where they were prized by the royalty, nobility and warlords.
The scarlet macaw is a large yellow, red and blue Neotropical parrot native to humid evergreen forests of the Americas. Its range extends from southeastern Mexico to Peru, Ecuador, Colombia, Bolivia, Venezuela and Brazil in lowlands of 500 m (1,600 ft) up to 1,000 m (3,300 ft), the Caribbean island of Trinidad, as well as the Pacific island of Coiba. Formerly, the northern extent of its range included southern Tamaulipas. In some areas, it has suffered local extinction because of habitat destruction, or capture for the parrot trade, but in other areas, it remains fairly common. It is the national bird of Honduras. Like its relative the blue-and-yellow macaw, the scarlet macaw is a popular bird in aviculture as a result of its striking plumage.
Feather-plucking, sometimes termed feather-picking, feather damaging behaviour or pterotillomania, is a maladaptive, behavioural disorder commonly seen in captive birds that chew, bite or pluck their own feathers with their beak, resulting in damage to the feathers and occasionally the skin. It is especially common among parrots, with an estimated 10% of captive parrots exhibiting the disorder. The areas of the body that are mainly pecked or plucked are the more accessible regions such as the neck, chest, flank, inner thigh and ventral wing area. Contour and down feathers are generally identified as the main target, although in some cases, tail and flight feathers are affected. Although feather-plucking shares characteristics with feather pecking commonly seen in commercial poultry, the two behaviours are currently considered to be distinct as in the latter, the birds peck at and pull out the feathers of other individuals.
The black-billed amazon is a parrot endemic to Jamaica. Sometimes called the black-billed parrot, this amazon parrot is mostly green with small patches of red on the wing and sometimes flecked on the head. Its bill makes it easy to separate from most other amazons, including the yellow-billed amazon, which also lives in Jamaica. It is the smallest Amazona parrot at 25 cm (10 in).
The red-shouldered macaw is a small green South American parrot, a member of a large group of Neotropical parrots called macaws. The species is named for the red coverts on its wings. It is the smallest macaw, being 30–35 cm (12–14 in) in length - similar in size to the Aratinga parakeets. It is native to the tropical lowlands, savannah, and swamplands of Brazil, the Guianas, Bolivia, Venezuela, and far south-eastern Peru. It has two distinct subspecies, the noble macaw and the Hahn's macaw, and a possible poorly distinct third subspecies that has longer wings, but is otherwise similar to the noble macaw. The Hahn's subspecies is named for German zoologist Carl-Wilhelm Hahn, who in 1834 began compiling Ornithologischer Atlas oder naturgetreue Abbildung und Beschreibung der aussereuropäischen Vögel.
The difficulty of defining or measuring intelligence in non-human animals makes the subject difficult to study scientifically in birds. In general, birds have relatively large brains compared to their head size. The visual and auditory senses are well developed in most species, though the tactile and olfactory senses are well realized only in a few groups. Birds communicate using visual signals as well as through the use of calls and song. The testing of intelligence in birds is therefore usually based on studying responses to sensory stimuli.
The rosy-faced lovebird, also known as the rosy-collared or peach-faced lovebird, is a species of lovebird native to arid regions in southwestern Africa such as the Namib Desert. Loud and constant chirpers, these birds are very social animals and often congregate in small groups in the wild. They eat throughout the day and take frequent baths. Coloration can vary widely among populations. Plumage is identical in males and females. Lovebirds are renowned for their sleep position in which they sit side-by-side and turn their faces in towards each other. Also, females are well noted to tear raw materials into long strips, "twisty-tie" them onto their backs, and fly substantial distances back to make a nest. These birds are common in the pet industry.
The red-lored amazon or red-lored parrot is a species of amazon parrot, native to tropical regions of the Americas, from eastern Mexico south to Ecuador where it occurs in humid evergreen to semi-deciduous forests up to 1,100 m altitude. It is absent from the Pacific side of Central America north of Costa Rica. Not originally known from El Salvador, a pair - perhaps escaped from captivity - nested successfully in 1995 and 1996 in the outskirts of San Salvador and the species might expand its range permanently into that country in the future. This species has also established feral populations in several California cities.
The Mascarene parrot or mascarin is an extinct species of parrot that was endemic to the Mascarene island of Réunion in the western Indian Ocean. The taxonomic relationships of this species have been subject to debate; it has historically been grouped with either the Psittaculini parrots or the vasa parrots, with the latest genetic study favouring the former group.
The Cape parrot or Levaillant's parrot is a large, temperate forest dwelling parrot of the genus Poicephalus endemic to South Africa. It was formerly grouped as a subspecies along with the savanna-dwelling brown-necked parrot and grey-headed parrot, but is now considered a distinct species.
A flock is a gathering of individual birds to forage or travel collectively. Avian flocks are typically associated with migration. Flocking also offers foraging benefits and protection from predators, although flocking can have costs for individual members.
Talking birds are birds that can mimic the speech of humans. There is debate within the scientific community over whether some talking parrots also have some cognitive understanding of the language. Birds have varying degrees of talking ability: some, like the corvids, are able to mimic only a few words and phrases, while some budgerigars have been observed to have a vocabulary of almost 2,000 words. The hill myna, a common pet, is well known for its talking ability and its relative, the European starling, is also adept at mimicry. Wild cockatoos in Australia have been reported to have learned human speech by cultural transmission from ex-captive birds that have integrated into the flock.
Vocal learning is the ability to modify acoustic and syntactic sounds, acquire new sounds via imitation, and produce vocalizations. "Vocalizations" in this case refers only to sounds generated by the vocal organ as opposed to by the lips, teeth, and tongue, which require substantially less motor control. A rare trait, vocal learning is a critical substrate for spoken language and has only been detected in eight animal groups despite the wide array of vocalizing species; these include humans, bats, cetaceans, pinnipeds, elephants, and three distantly related bird groups including songbirds, parrots, and hummingbirds. Vocal learning is distinct from auditory learning, or the ability to form memories of sounds heard, a relatively common trait which is present in all vertebrates tested. For example, dogs can be trained to understand the word "sit" even though the human word is not in its innate auditory repertoire. However, the dog cannot imitate and produce the word "sit" itself as vocal learners can.
Parrots (Psittaciformes), also known as psittacines, are birds with a strong curved beak, upright stance, and clawed feet. They are conformed by four families that contain roughly 410 species in 101 genera, found mostly in tropical and subtropical regions. The four families are the Psittaculidae, Psittacidae, Cacatuoidea (cockatoos), and Strigopidae. One-third of all parrot species are threatened by extinction, with a higher aggregate extinction risk than any other comparable bird group. Parrots have a generally pantropical distribution with several species inhabiting temperate regions as well. The greatest diversity of parrots is in South America and Australasia.
Eufalconimorphae is a proposed clade of birds, consisting of passerines, parrots, falcons, caracaras, and forest falcons. It has whole-genome DNA support. Eufalconimorphae birds are characterized by their strong and hooked beaks, sharp talons, and powerful wings. They have excellent eyesight, which allows them to spot their prey from great distances. The Eufalconimorphae is noted to produce aerodynamic force during the upstroke of flight to help create a vertical flight pattern.
The Timneh parrot, also known as the Timneh grey parrot or Timneh African grey parrot, is a West African parrot. Formerly classified as a subspecies of the grey parrot Psittacus erithacus timneh, it is now considered a full species Psittacus timneh. In aviculture, it is often referred to by the initials TAG and is commonly kept as a companion parrot.
The grey parrot, also known as the Congo grey parrot, Congo African grey parrot or African grey parrot, is an Old World parrot in the family Psittacidae. The Timneh parrot (Psittacus timneh) once was identified as a subspecies of the grey parrot, but has since been elevated to a full species.