There are two subspecies: the Congo African Grey Parrot and the slightly smaller Timneh African Grey Parrot. As their names, both subspecies are predominantly grey. They have dark grey wings and a pale grey rump. A featherless rim of skin around the eyes is whitish to light grey. The head and neck feathers have paler margins, giving that part of the body a scalloped appearance. The Congo African Grey's tail is red and the Timneh African Grey's is dark maroon.
The African Grey Parrot is popular as a pet or companion parrot, especially the Congo African Grey Parrot, partly because of its ability to imitate speech. The African Grey Parrot is listed on CITES appendix II, which restricts trade of wild caught species, because wild populations can not sustain trapping for the pet trade.
There are two subspecies universally accepted:
Some aviculturalists recognize a third and even a fourth subspecies, but these are not distinguishable in scientific studies.
The "Ghana African Grey," formerly recognized as subspecies Psittacus erithacus princeps, is described as similar to the Congo African Greys, but darker and slightly smaller, and originates from Fernando Po and Principé Islands.
The "Cameroon African Grey," most often referred to as "the big silvers," is supposedly a larger and lighter form which actually has its origin in birds not from Cameroon but from today's Democratic Republic of the Congo.
Other mutations include:
While comparative judgements of animal intelligence are always very difficult to make objectively, Psittaciformes are generally regarded as being the most intelligent of birds. African grey parrots are particularly noted for their cognitive abilities, which are believed to have evolved as a consequence of their history of cooperative feeding as largely tree-dwelling birds in central Africa.
Irene Pepperberg's extensive research with captive African greys, especially the one known as Alex, have provided evidence that these parrots are capable of associating human words with their meanings, at least to some extent, though these conclusions are disputed. Ambitious claims of language use have been made for another African grey, N'kisi, who has a vocabulary of around a thousand words and speaks in sentences. Although there exists a great deal of debate as to just how well these birds actually understand the meaning of the words they speak, there is little doubt that Greys and other parrots (especially macaws and cockatoos), along with corvines (crows, ravens, and jays), are highly intelligent in comparison with other birds.
It is widely believed in the parrot-keeping community that Greys understand their human companions at various human intelligence levels. For example, some believe that a young Grey (under a year) has the equivalent understanding of a human toddler and the cognitive ability of a 6-year-old human child.
The history of African Grey parrots kept as pets dates back over 4,000 years. Some Egyptian hieroglyphics clearly depict pet parrots. The ancient Greeks also valued parrots as pets. This custom was later adopted by wealthy Roman families who often kept parrots in ornate cages. King Henry VIII of England also had an African Grey parrot. Portuguese sailors kept them as companions on their long sea voyages.
Today, many African Grey parrots are hand-reared by breeders for the pet trade, and they can make wonderful and very affectionate companion parrots; however, the methods used to produce the birds for the pet trade greatly affects their behavior and "pet quality" once the birds are mature at 2 to 4 years old. The hand-rearing process deprives the birds of parental interactions, which results in the birds becoming imprinted on humans at maturity. This is done primarily to produce tamer birds, as they learn how to interact with other animals from their parents' behavior, and the often untamed breeder birds may pass down a fear of humans. The degree to which a bird was hand reared may vary depending on the breeder's method - some are hand-reared from the point of (artificial) incubation, while others may be left with their parents for a few weeks. The degree to which a bird has been deprived of its natural parents can adversely affect its behaviour once it is an adult; birds which have been raised at least partially by natural parents tend to show fewer behavioural problems (such as plucking or fearfulness) upon maturity (Schmid et al 2005), though birds raised entirely by their parents may be less tame. Some breeders may hand rear babies in the presence of tame adult pet Greys that may serve as role models for the babies. Also to be considered is how a baby grey is weaned and fledged. A baby Grey should be abundance-weaned (allowed to wean at its own pace) and be allowed to learn to fly. Force-weaning and clipping a baby before it learns to fly are believed to occasionally cause development of fearful behaviors when the young grey reaches several years of age. Some grey parrots may not be compatible with small children. African Grey parrots are very strong and can inflict serious wounds on human flesh with their powerful beaks. Their nails are naturally sharp and can scratch, though the birds do not use them aggressively. Pet owners often liken the experience of keeping an African Grey to that of raising a young child - not only because of the birds' intelligence, but also from the substantial time commitment required. While captive-bred birds usually assimilate into their new households with relative ease, wild-caught African Grey parrots (which are no longer legally available in the US or EU) can find it difficult or impossible to adapt to life in a cage as a pet. They may show great fear of humans, emit a growling sound as a fear response, and may panic when approached. Unlike more common pets, African Grey parrots have not been greatly "modified" by selective breeding; they are only available as wild-type birds. As opposed to the many color varieties available in budgies and Rose-ringed Parakeets, the closest African Grey Parrots get to a color variant are the "Cameroon African Greys" which are a natural variation of the normal wild bird's colour.
African Grey parrots, like most pet parrots, are considered by many to be very high-maintenance pets, as they require a good deal of personal attention and many hours each day out of their cages. While numbers vary with each source, most agree that three hours out of cage daily and 45 minutes of physical interaction is the minimum attention required for good mental health. African Greys, particularly Congo African Greys, are known to be wary of strangers, and tend to bond solely with their main carer if they do not interact with different people regularly. While interspecies friendships with other parrots are uncommon, as African Greys are essentially social animals, they will benefit from being kept in the company of other birds.
Grey parrots are prone to behavioral problems if they are not provided with a stimulating environment and allowed plenty of time out of their cage each day. They should be given a range of regularly changed toys to keep them occupied, including destructible ones made from natural materials such as cardboard, wood, or natural fibers. Toys should also include "puzzle toys" or "foraging toys," which hold food treats that the bird must learn how to extract from the toy. Boredom and overuse of the cage can typically lead to problems such as self-plucking, where the bird damages or removes its own feathers. Many Greys are traditionally kept in cages too small to allow the bird to fly, and occasionally for young, clumsy or very nervous Greys (often Greys that have been clipped at a young age), a smaller cage may indeed be necessary for a time to avoid the bird from falling and injuring itself or becoming frightened. However, most Greys will benefit greatly from a large cage which allows more space for different perches, toys, and exercise. Provided the bird spends several hours each day out of the cage, interacting with its caretaker and/or other birds and people, a cage which is 4 feet long by 3 feet deep and 3 feet high is adequate. The bar-spacing should be ¾ inch to 1 inch. The height of a cage is typically not important, except in the case of playtop cages that are taller than the owner, in which case the bird may show some aggressive behaviours. Grey parrots kept as companion animals should have access to a range of other places within the room in which they are kept, including a playstand holding a range of perches and further toys. A companion African Grey should be kept in a bird-safe environment and placed in a fairly 'busy' part of the home, such as the living room, to allow the bird to be occupied with observing the household activities. However, the cage should always have a solid back or be placed against a solid wall, as this helps to give the bird a feeling of security not otherwise available due to the "goldfish bowl effect" of being in a cage.
Grey parrots should be trained to accept some requests or "commands" from their carers, including flight requests; this ensures most birds can fly safely and removes the 'need' for wing-clipping Glendell 2007). Wing clipping is very controversial. Some owners prefer to clip to prevent potentially dangerous indoors flying. However, wing clipped birds are no safer than full-winged birds, but merely subject to different risks as pet birds (Glendell 2007). African Greys are heavy-bodied birds and more prone to clipping-related problems than some other parrots. Clipped birds may crash and injure themselves, often on the sternum. Clipping birds may also damage new "blood" feathers, as these grow down in the moulting process, which can result in painful persistent bleeding. Severely clipped birds may have balance problems and fall often. Preferably, greys should not be clipped at all. If a Grey is clipped, it must be done by someone who understands the moulting sequence of the bird so as to avoid damage to blood feathers when these grow down on a clipped wing during the bird's moulting period. A clipped Grey should still be able to fly or glide short distances to avoid injury. Birds with clipped or damaged flight feathers can have flight restored immediately by a specialist avian vet imping (splinting) donor feathers back onto the bird's clipped feathers.
Rarer than previously believed, it is uplisted from a species of Least Concern to Near Threatened in the 2007 IUCN Red List. A recent analysis suggests that up to 21% of the global population may be taken from the wild annually, primarily for the pet trade.
The species is endemic to primary and secondary rainforest of West and Central Africa. Grey parrots depend on large old trees for the natural hollows they use for nesting. Studies in Guinea and Guinea-Bissau have found that the preferred species of nesting trees are also preferred timber species. There is a positive relationship between the status of the species and the status of primary forest: where the forests are declining, so too are populations of Grey parrots.
The African 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 has been made that the export is non-detrimental to the species in the wild. With exports totaling more than 350,000 specimens from 1994-2003, 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 U.S. Wild Bird Conservation Act of 1992. In the European Union, an EU Directive of 2007 prevents importation of this and any other "wild-caught" bird for the pet trade.
Schmid, R. Doherr, M G. Steiger, A The influence of the breeding method on the behaviour of adult African grey parrots (Psittacus erithacus). Applied Animal Behaviour Science 2005, see www.elsevier.com/locate/applanim