Hyacinth macaw

Name and taxonomy

The English physician and artist John Latham described the bird in 1790. He named it Psittacus hyacinthinus and worked from a single stuffed skin. That skin came from a live bird once kept by Lord Orford. It went to the Leverian Museum after the bird died. Latham knew of no other specimen until 1822.

Tony Pittman argued in 2000 that Latham may have measured a Lear's macaw. The drawing in Latham's work still looks like a true hyacinth macaw. Early authors also used the name blue macaw for several unrelated parrots. Trade in live birds moved parrots around the world and confused their origins. The English name probably comes from the deep blue of the hyacinth flower.

Evolution and relatives

The genus Anodorhynchus holds two living species and one that has almost certainly gone. Lear's macaw of north-eastern Brazil is the smaller living relative. The glaucous macaw is the third member, and it is probably extinct. All three are blue, so old sight records may be hard to sort out. Macaws sit in the parrot family Psittacidae.

Parrots are among the most threatened birds on Earth. In tropical America, 46 of 145 parrot species face a serious risk of extinction. Genetic variation in the hyacinth macaw is low. That alone does not endanger the species today. A smaller population would let genetic drift take a stronger hold. Researchers therefore want each regional group protected on its own.

Appearance

Adults measure 95 to 100 centimetres from the crown to the tail tip. About half of that length is the long, pointed tail. The wingspan runs 117 to 127 cm, and each wing is 38.8 to 42.5 cm long. Weight ranges from 1.2 to 1.7 kilograms. The plumage is an even ultramarine blue, glossy and slightly lighter on the back.

The underside of the wing and tail shows a lot of black. Neck feathers can carry a faint grey cast. A ring of bare yellow skin circles each eye. A second yellow band runs along the base of the lower bill. The huge hooked bill is black, and the legs are short and sturdy. Males and females look alike, so a watcher probably cannot separate them in the field.

Habitat and range

Three main areas hold the species today. The first is the Pantanal of Brazil, with eastern Bolivia and north-eastern Paraguay. The second is the cerrado country of the eastern Brazilian interior. The third lies along the Tocantins, Xingu and Tapajos rivers and on Marajo island. GBIF holds occurrence records from 10 countries, and iNaturalist carries 2,274 observations.

The bird likes semi-open, lightly wooded country. It avoids dense humid forest and keeps to edges and river banks where such forest dominates. Elsewhere it uses savanna grassland, dry caatinga thorn woodland and palm swamp. About 80% of the Pantanal floodplain goes under water in the rains. In Bolivia the macaws favour cattle ranches that graze their land lightly. Escaped birds live in Florida, but nobody has shown that they breed there.

Diet and feeding

Palm nuts make up most of what the hyacinth macaw eats. The acuri and bocaiuva palms are the main sources across the range. In the Pantanal the birds live almost entirely on two palms, Acrocomia aculeata and Attalea phalerata. One count put the number of palm species used at eight. The birds also take fruit, small seeds, palm sprouts and the odd snail. They will fly a long way to reach the ripest crop.

The bill first files the shell thin in one place, then splits it cleanly. It can break coconuts, Brazil nut pods and macadamia nuts. The tongue is dry and smooth, with a bone inside that helps prise fruit open. Most feeding happens on the ground, under the palms. The acuri nut only softens enough to eat after cattle have passed it. Keepers offer macadamia nuts to captive birds instead of the native palms.

Wild and captive macaws both use simple tools while feeding. A bird wedges a chewed leaf or a scrap of wood against a nut. The wedge stops the nut slipping as the bill bites in. Hand-reared birds do it too, so the habit may be innate rather than learned. Older macaws open seeds faster than young ones. Henry Walter Bates described the nut cracking in 1863, and Charles Darwin called the bird splendid.

Behaviour and social life

Hyacinth macaws are highly social and spend most of their lives in pairs. Courtship, mating and bonding go on all through the year. Birds are busiest from early morning to the middle of the afternoon. They fly to feeding grounds in parties of two to eight. At sunset they return to a roost tree and stay there for the night.

The size of a home range depends on where the palm crop is. Some pairs stay near the roost, while others commute a long way each day. The bill works as a third foot when the bird climbs. Short strong legs let a macaw hang sideways or upside down in a palm. Keepers call the species a gentle giant, because it is calm for its size. The bird is noisy, bold, curious and predictable, which makes it easy to trap.

Communication and senses

The voice is harsh and guttural, and alarm brings the loudest calls. A pair calls back and forth in flight, which probably keeps them together. Captive birds learn a few words and can use them in the right place. They are not strong talkers compared with some other parrots. Owners still rate the species as an intelligent bird.

The bare yellow face stands out sharply against the blue plumage. Such a patch may work as a close-range signal between birds. Parrots elsewhere in the Amazon gather at clay banks to eat earth. Research by Donald Brightsmith points to the sodium in the earth as the reason. Like other parrots, the macaw relies most on sight and hearing.

Reproduction and life cycle

Pairs stay together for life and defend one nest site. Nesting runs from July to December, and in the Pantanal it follows the wet season. Nine nests in ten in the Pantanal sit in a manduvi tree. Only a manduvi of about 60 years or more grows a hollow of the right size. Competition for those hollows is fierce among many hole-nesting animals. The pair widens an old hole and part fills the floor with wood chips.

Nest holes usually sit 4 to 14 metres above the ground. The hen lays one or two eggs, two days apart. Incubation lasts 25 to 28 days, and the hen sits for about 70% of the time. The male feeds her at the nest throughout. About nine eggs in ten hatch when predators leave them alone. When both eggs hatch, the second chick almost never survives the first.

Biologists call the second egg an insurance egg against an early failure. A chick fledges at about 110 days, or roughly 13 weeks. It depends on its parents for six months and often stays near them for 18 months. Birds breed from about seven years old, and some wait until they are 10. One hundred pairs produce only 7 to 25 young in a year. A long life makes up for the slow rate, and wild birds may reach 50 years.

Predators and threats

Egg thieves are the main natural danger. Jays, crows, coatis, skunks and opossums all raid the nests. The toco toucan takes over half of the eggs that are lost to predators. The same toucan spreads 83% of the manduvi seeds the macaw depends on. Larvae of Philornis flies feed on the chicks in the nest.

The heaviest pressure comes from people. Cattle ranching and mechanised farming have taken or altered much of the habitat. Dams on the Tocantins and Xingu flooded more of it. Grass fires lit by farmers each year destroy nest trees. Cattle also eat the young manduvi saplings that would replace them.

Trappers took an estimated 10,000 birds from the wild during the 1980s. Half of those were sold inside Brazil. In the markets of Santa Cruz the bird fetched the top price of US$1,000. Chicks travel badly, and a Paraguayan dealer who received 300 in 1972 lost all but three. Poachers therefore target adults, which strips breeding birds from the population fastest. Feather demand adds pressure, because up to 10 macaws go into one headdress.

Population and conservation

The IUCN lists the hyacinth macaw as Vulnerable. Charles Munn published the first real estimate in 1987 at 3,000 birds. His range ran from 2,500 to 5,000. By 2004 the World Wildlife Fund put the wild total at 6,500. Brazil and Bolivia protect the bird by law. CITES placed it on Appendix I in 1987, which bans commercial export.

Bolivian counts in one protected area gave 231, 107, 134 and 166 birds. Surveyors think about 300 live in that area, though the swamps make counting hard. Conservationists want each of the three main populations kept above 500. The Hyacinth Macaw Project rings birds and puts up artificial nest boxes. The European Endangered Species Programme began in 1989 after captive breeding proved hard. Mato Grosso do Sul named the bird its symbolic species in 2025.

Relationship with humans

People keep hyacinth macaws as companion parrots, though the bird suits no beginner. A young bird can cost US$10,000. The bill destroys ordinary cages, so keepers use custom stainless steel. The World Parrot Trust asks that no bird live permanently indoors. It should have a flight of at least 15 metres for part of the year.

The species needs company, exercise and things it is allowed to chew. A bored or badly reared bird can turn phobic and hard to handle. It is even-tempered, but a playful bite still breaks skin. Hand-reared chicks die more often than parent-reared ones in the first month.

The bird is probably worth more alive to local people than it ever was to a trapper. Birdwatchers travel to the Pantanal to see it, and tourism supports local work. Many ranch owners in the Pantanal and the Gerais now bar trappers from their land. Local people have also hunted the macaw for food.

In culture and myth

The Kayapo of south-central Brazil use macaw feathers in ceremonial dress. A chief's headdress carries bright plumes, and each one represents a ray of sunlight. Men wear headbands of radiating feathers as an image of the whole universe. The Kayapo do not dye the feathers, because Amazon birds are already bright. Commercial demand for such work has raised the toll on wild macaws.

Macaw feathers mattered across pre-Columbian South America. Inca, Wari and Nazca weavers worked them into cloth, ornaments and burial bundles. Ychsma traders on the coast kept live birds, brought over the mountains, as a feather source. That trade suggests how far a bright feather could travel before Europeans arrived.

Near the Bolivian border with Brazil and Paraguay the macaw is a regional emblem. Local people feed the birds maize in the way they feed chickens. In 2025 the Brazilian state of Mato Grosso do Sul made it the state bird by law. Supporters hope the title will protect the species and draw visitors. Charles Darwin repeated Bates's account and called the macaw a splendid bird.