The hyacinth macaw (Anodorhynchus hyacinthinus), also known as the hyacinthine macaw, is a parrot native to central and eastern South America. Known for its striking blue plumage and impressive size, this species is the largest macaw and the largest flying parrot species. While generally easily recognized, it could be confused with the smaller Lear's macaw. This article delves into the hyacinth macaw's diet in the wild and in captivity, its habitat, and conservation efforts aimed at protecting this vulnerable species.
Taxonomy and Description
English physician, ornithologist, and artist John Latham first described the hyacinth macaw in 1790 under the binomial name Psittacus hyacinthinus. Tony Pittman in 2000 hypothesized that although the illustration in this work appears to be of an actual hyacinthine macaw, Latham's description of the length of the bird might mean he had measured a specimen of Lear's macaw instead. However, Latham's description was based on a taxidermic specimen, which was the only one Latham knew to exist up until 1822.
The largest parrot by length in the world, the hyacinth macaw is 1 m (3 ft 3 in) long from the tip of its tail to the top of its head and weighs 1.2-1.7 kg (2 lb 10 oz - 3 lb 12 oz). Each wing is 38.8-42.5 cm (15+1⁄4-16+3⁄4 in) long. The tail is long and pointed. Its feathers are mostly blue, lighter above, the neck feathers can sometimes be slightly grey, large parts of the underwing and undertail are black. These physical characteristics, combined with its behavior and habitat preferences, make the hyacinth macaw a unique and fascinating species.
Habitat and Distribution
The hyacinth macaw occurs today in three main areas in South America: In the Pantanal region of Brazil, and adjacent eastern Bolivia and northeastern Paraguay, in the cerrado regions of the eastern interior of Brazil (Maranhão, Piauí, Bahia, Tocantins, Goiás, Mato Grosso, Mato Grosso do Sul, and Minas Gerais), and in the relatively open areas associated with the Tocantins River, Xingu River, Tapajós River, and the Marajó island in the eastern Amazon Basin of Brazil. Over the last few decades the known range in Bolivia has grown. It is well known from the far southeast of the country near the tri-national border point with Brazil and Paraguay, where it is considered an emblematic symbol of the region, and locals often feed the macaws maize, like chickens. In the early 1990s it became apparent the species also occurred in the remote Noel Kempff Mercado National Park area a few hundred kilometres northward. Most of the Bolivian population of this macaw is thought to be found in the San Matías Integrated Management Natural Area, an area with extensive pantanal (swamp). Censuses conducted in 2008, 2009, 2011 and 2014, revealed stable population numbers: respectively 231, 107, 134, and 166. Bird counts in such swampy and difficult to navigate terrain are inherently inadequate. The censuses were performed by visiting locations with previously reported sightings; however, it was not always possible to visit all sites, and coverage varied.
It prefers semi-open, somewhat wooded habitats. It usually avoids dense, humid forest, and in regions dominated by such habitats, it is generally restricted to the edge or relatively open sections (e.g. along major rivers). A 2014 Bolivian study in San Matías Integrated Management Natural Area which correlated sightings to habitat found that areas including seasonally inundated savannas, wetlands and anthropogenic areas habitats interspersed with a mosaic of savannas, were the best indicators for the presence of the macaws. The most preferred habitat by far was anthropogenic, which is primarily cattle ranches practising extensive grazing in this area.
Read also: Macaw Feeding Guide
Diet in the Wild
The majority of the hyacinth macaw diet is composed of nuts from specific palm species, such as the acuri and bocaiuva palms. They have very strong beaks for eating the kernels of hard nuts and seeds. Their strong beaks are even able to crack coconuts, the large Brazil nut pods, and macadamia nuts. The birds also boast dry, smooth tongues with a bone inside them that makes them an effective tool for tapping into fruits. The acuri nut is so hard that the parrots cannot feed on it until it has passed through the digestive system of cattle. In addition, they eat fruits and other vegetable matter. The hyacinth macaw generally eats fruits, nuts, nectar, and various kinds of seeds. In the Pantanal, hyacinth macaws feed almost exclusively on the nuts of Acrocomia aculeata and Attalea phalerata palm trees. It flies in pairs, and feeds on the hard nuts of several palms, but especially of the Mucuja (Acrocomia lasiospatha).
Limited tool use has been observed in both wild and captive hyacinth macaws. Reported sightings of tool use in wild parrots go as far back as 1863. Examples of tool use that have been observed usually involve a chewed leaf or pieces of wood. Macaws often incorporate these items when feeding on harder nuts. Their use allows the nuts the macaws eat to remain in position (prevent slipping) while they gnaw into it. It is not known whether this is learned social behavior or an innate trait, but observation on captive macaws shows that hand-raised macaws exhibit this behavior, as well.
Breeding and Development
Nesting takes place between July and December, with nests constructed in tree cavities or cliff faces depending on the habitat. In the Pantanal region, 90% of nests are constructed in the manduvi tree (Sterculia apetala). The hyacinth macaw depends on the toucan for its livelihood. The toucan contributes largely to seed dispersal of the manduvi tree that the macaw needs for reproduction. However, the toucan is responsible for dispersing 83% of the seeds of Sterculia apetala, but also consumes 53% of eggs preyed. Hollows of sufficient size are only found in trees around 60 years of age or older, and competition is fierce. Existing holes are enlarged and then partially filled with wood chips. The clutch size is one or two eggs, although usually only one fledgling survives as the second egg hatches several days after the first, and the smaller fledgling cannot compete with the firstborn for food. A possible explanation for this behaviour is what is called the insurance hypothesis.
Development phases of the chicks: (A) nestling, 0-25 days, mass gain at this phase is slow, (B) chick, 26-77 days, geometric growth until maximum weight is attained, (C) chicks, and (D) juvenile, 78-107 days.
Diet in Captivity
In captivity, the palm nuts native to the hyacinth macaw's natural habitat are often not readily available. An attending veterinarian must be aware of specific nutritional needs and pharmacologic sensitivities when dealing with them. Instead, a diet consisting of specially formulated parrot pellets, along with a variety of fruits, vegetables, and nuts, is typically provided. It is essential to offer a balanced diet that meets the macaw's nutritional requirements to ensure its health and longevity.
Read also: The Hoxsey Diet
Conservation Status and Threats
The conservation status of the hyacinth macaw is assessed as vulnerable. The first proper estimate of its total wild population was published by Munn in 1987 as 3,000 individuals, with a range of 2,500 to 5,000. On July 3, 2025, the hyacinth macaw was recognized as the symbolic bird of Mato Grosso do Sul after the approval of Law No. 6.442. Throughout the macaw's range, habitat is being lost or altered due to the introduction of cattle ranching and mechanised agriculture, and the development of hydroelectric schemes. Annual grass fires set by farmers can destroy nest trees, and regions previously inhabited by this macaw are now unsuitable also due to agriculture and plantations. Locally, it has been hunted for food, and the Kayapo Indians of Gorotire in south-central Brazil use its feathers to make headdresses and other ornaments.
Parrots, as a whole, being of the family Psittacidae, are some of the most threatened birds in the world. This family has the most endangered species of all bird families, especially in the neotropics, the natural home of the hyacinth macaw, where 46 of 145 species are at a serious risk of global extinction. This species qualifies as 'Vulnerable' on the IUCN Red List because the population has suffered rapid reductions with the remaining threats of illegal trapping for the cage bird trade and habitat loss. A few serious threats to the survival of the species in the Pantanal include human activities, mainly those resulting in habitat loss, the burning of land for pasture maintenance, and illegal trapping.
The exceptionally noisy, fearless, curious, sedentary, and predictable nature of this species, along with its specialization to only one or two species of palm in each part of its range, makes them especially vulnerable to capture, shooting, and habitat destruction. Because this species exclusively relies on the fruit produced by two palm species, if these species were to suffer due to disease or habitat destruction, it would put the parrot species at risk. This species specifically requires previously occupied holes within the Manduvi trees in order to nest, so nesting availability can be sparse. Furthermore, old growth of these trees, the youngest being 60 years, is required for the species to produce large enough holes to nest. Although the species has low genetic variability, it does not necessarily pose a threat to their survival. This genetic structure accentuates the need for protection of hyacinth macaws from different regions to maintain their genetic diversity. If populations and genetic diversity continue to decrease, it could become a major conservation issue in the future. A smaller population of hyacinth macaws will increase the influence of genetic drift, and, therefore, increase the risk of extinction. A lower genetic variation could send populations into an extinction vortex.
In the Pantanal, habitat loss is largely contributed to the creations of pastures for cattle, while in many other regions, it is the result of clearing land for colonization. Similarly, large areas of habitat in Amazonia have been lost for cattle ranching and hydroelectric power schemes on the Tocantins and Xingu Rivers. In the case of macaws being taken from their natural environment, a variety of factors alter their health such as inadequate hygiene conditions, feeding, and overpopulation during the illegal practice of pet trade. Once birds are captured and brought into captivity, their mortality rates can become very high. Records reveal a Paraguayan dealer receiving 300 unfeathered young in 1972, with all but three perishing.
Conservation Efforts
According to Article 111 of Bolivian Environmental Law #1333, all persons involved in the trade, capture, and transportation without authorization of wild animals will suffer a two-year prison sentence, along with a fine equivalent to 100% of the value of the animal. While many trackers have been arrested, the illegal pet trade still largely continues in Santa Cruz, Bolivia. Unfortunately, animal trafficking is not necessarily viewed as a priority in the city, leaving national departmental and municipal governments unwilling to halt the trade in city centers, and local police reluctant to get involved. This ideology has in turn resulted in a lack of enforcement regarding trade in both CITES-restricted species and threatened species, with little to no restrictions regarding humane treatment of the animals, disease control, or proper hygiene.
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In 1989, the European Endangered Species Programme for the hyacinth macaw was founded as a result of concerns about the status of the wild population and the lack of successful breeding in captivity. Breeding in captivity still remains difficult, being that hand-reared hyacinth macaw offspring have been demonstrated to have higher mortality rates, especially within the first month of life. Additionally, they have a higher incidence of acute crop stasis than other macaw species due, in part, to their specific dietary requirements.
The hyacinth macaw is protected by law in Brazil and Bolivia, and international trade is prohibited by its listing on Appendix I of the CITES. Appendix I has banned exporting the bird in all countries of origin, and several studies and conservational initiatives have been taken. The Hyacinth Macaw Project in the Caiman Ecological Refuge, located in the Pantanal, has employed artificial nests and chick management techniques, along with effectively raising awareness among cattle ranchers.
A number of conservation actions have been proposed, including the study of the current range, population status, and extent of trading in different parts of its range. Each of the three main populations should be managed as a separate biological entity so as to avoid numbers dropping below 500. While the birds may be in decline in the wild, notably higher populations of captive macaws are being held in zoos and private collections. If success in managing and replanting the macaw's food trees and erecting nest boxes as an experiment in the Pantanals is seen, the species could survive. Survival rates could also be enhanced if ranch owners would leave all large and potential nest trees standing and eliminate all trapping on their properties.
Hyacinth Macaws as Pets
The hyacinth macaw is sometimes kept as a companion parrot. Not recommended for novice bird-keepers, this bird requires large amounts of space, regular exercise and a custom-built stainless steel cage, as its powerful beak can easily destroy most commercially available parrot cages. In order to remain healthy, the species requires regular social interaction and play with humans or other birds. This large macaw, like most parrots, has a natural inclination to chew objects and due to its physical size and strength, can cause considerable damage. It is recommended that an entire room of the owner's home be set aside for use by the bird, which should be provided with plenty of safe, destroyable wooden and leather objects to keep it amused. This bird is often described as "gentle". It is not generally an aggressive bird and it appears to enjoy interacting playfully with humans. The hyacinth macaw can learn to talk, but it is not as gifted in that area as some other species.