Anodorhynchus glaucus 

Scope: Global
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Psittaciformes Psittacidae

Scientific Name: Anodorhynchus glaucus (Vieillot, 1816)
Common Name(s):
English Glaucous Macaw
Spanish Ara Azul, Guacamayo Glauco, Guacamayo Violáceo
Taxonomic Source(s): SACC. 2005 and updates. A classification of the bird species of South America. Available at: #
Identification information: 70 cm. Large blue macaw. Pale turquoise-blue with large greyish head. Proportionally long tail and massive bill. Yellow, bare eye-ring and half-moon-shaped lappets bordering mandible. Similar spp. Lear's Macaw A. leari has a bluer head and is not sympatric, but specimens in trade could be confused. Hyacinth Macaw A. hyacinthinus is considerably larger and bulkier, more violet-blue in colouration and yellow lappets extend along the base of the mandible. Also not sympatric. Voice Unknown.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered D ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Clay, R.
Facilitator/Compiler(s): Benstead, P., Bird, J., Butchart, S., Clay, R., Sharpe, C J & Symes, A.
This species was last recorded in the 1960s and it is likely to have declined severely as a result of hunting and trapping, plus habitat degradation and destruction. However, it may well remain extant, because not all of its formerly large range has been adequately surveyed, and there have been persistent and convincing local reports. Any remaining population is likely to be tiny, and for these reasons it is treated as Critically Endangered.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Anodorhynchus glaucus was formerly widespread but clearly very local in north Argentina, south Paraguay, north-east Uruguay and Brazil from Paraná state southwards. It was endemic to the middle reaches of the major rivers (Uruguay, Paraná and Paraguay) and adjacent areas, with most records coming from Corrientes, Argentina. It became rare before or early in the second half of the 19th century and there were only two acceptable records in the 20th century, one direct observation (in Uruguay in 1951) and one based on local reports (in Paraná in the early 1960s). Whilst it has been generally treated as extinct, persistent rumours of recent sightings, local reports and birds in trade indicate that a few birds may still survive.

Countries occurrence:
Argentina; Brazil; Paraguay; Uruguay
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:1
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Any remaining population is assumed to be tiny (numbering fewer than 50 individuals and mature individuals) based on the lack of confirmed records since the 1960s.
Current Population Trend:Unknown
Additional data:
Number of mature individuals:1-49Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It was reported mostly along major rivers, but this may reflect travellers' dependence on river transport rather than the species's true habitat requirements. It appears to have been adapted to consume palm nuts as its staple, and therefore presumably wandered into palm-savannas and potentially lightly wooded areas. The only palm in its range with the appropriate size and type of nut is the Yatay (or Chatay) palm Butia yatay (Yamashita and Valle 1993). It nested and roosted on cliffs and the average clutch-size was probably two eggs (Collar et al. 2014).

Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):10.4
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Settlement of the major river basins within its range was presumably accompanied by the widespread loss of palm-groves, either through direct clearance for agriculture or the suppression of regeneration by colonists' cattle. Yatay palm, which the species probably fed on, was targeted for clearance by early colonists as it is an indicator of good soil quality (Collar et al. 2014). Widespread loss of gallery forests could also have had an impact on the species (Collar et al. 2014). The size and appearance of the bird probably made it a significant target for hunters, and even the taking of young as pets could have been important. There is some evidence that it was traded, but little to support various claims that there has been recent trade in live specimens. Any current trade in eggs, skins or live specimens would obviously be extremely harmful.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix I and protected under Brazilian law. There have been various attempts (so far unsuccessful) to rediscover the species. There are ongoing funding proposals to attempt to finance a programme of work aimed at confirming this species's presence in the wild.

Conservation Actions Proposed
Conduct interviews with local people, especially former and active parrot trappers, to assess the likelihood that any populations remain. Prepare to follow-up on any positive data from these interviews.

Citation: BirdLife International. 2016. Anodorhynchus glaucus. The IUCN Red List of Threatened Species 2016: e.T22685527A93078084. . Downloaded on 20 September 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided