|Blue-and-yellow macaw (left) and green-winged macaw (right) at Jurong Bird Park, Singapore|
Ara is a neotropical genus of macaws with eight extant species and at least two extinct species. The genus name was coined by French naturalist Bernard Germain de Lacépède in 1799. It gives its name to and is part of the Arini, or tribe of neotropical parrots. The genus name Ara is likely related to arara, the Portuguese word for a macaw, itself derived from the Tupi word a'rara.
The Ara macaws are large striking parrots with long tails, long narrow wings and vividly coloured plumage. They all have a characteristic bare face patch around the eyes. Males and females have similar plumage. Many of its members are popular in the pet trade, and bird smuggling is a threat to several species.
For many years the genus Ara contained a number of other species. Three genera have been split out from the genus, Orthopsittaca, Primolius, and Diopsittaca. Orthopsittaca and Diopsittaca are two monotypic genera that were morphologically and behaviourally different, whereas the three Primolius macaws are three smaller green macaws.
Species and subspecies
There are eight surviving species and two extinct species. The last confirmed sighting of the extinct Cuban red macaw was in 1864 when one was shot. Several skins of the Cuban red macaw are preserved in museums, but none of its eggs have survived.
The Ara genus is subdivided as follows:
- Blue-and-yellow macaw, Ara ararauna (Linnaeus, 1758)
- Blue-throated macaw, Ara glaucogularis Dabbene, 1921
- Military macaw, Ara militaris (Linnaeus, 1766)
- Great green macaw or Buffon's macaw, Ara ambiguus (Bechstein, 1811)
- Ara ambiguus ambiguus (Bechstein, 1811)
- Ara ambiguus guayaquilensis Chapman, 1925
- Scarlet macaw, Ara macao (Linnaeus, 1758)
- Ara macao cyanopterus Wiedenfeld, 1995
- Ara macao macao (Linnaeus, 1758)
- Red-and-green macaw or green-winged macaw, Ara chloropterus Gray, 1859
- Red-fronted macaw, Ara rubrogenys Lafresnaye, 1847
- Chestnut-fronted macaw or severe macaw, Ara severus (Linnaeus, 1758)
- †Cuban red macaw, Ara tricolor Bechstein, 1811 (extinct: last known individual shot in 1864)
- †Saint Croix macaw, Ara autocthones Wetmore, 1937 (extinct, known from subfossil bones)
- †Lesser Antillean macaw, Ara guadeloupensis Clark, 1905 (extinct, known from subfossil bones and descriptions)
Hypothetical extinct species
Several hypothetical extinct species of the Ara genus have been postulated based on very little evidence. They may have been distinct species, or familiar parrots that were imported onto an island and later presumed to have a separate identity.
- Martinique macaw, Ara martinica (Rothschild, 1905)
- Jamaican green-and-yellow macaw or Red-headed macaw,Ara erythrocephala Gosse, 1847
- Jamaican red macaw , Ara gossei Rothschild, 1905
- Dominican green-and-yellow macaw, Ara atwoodi Clark, 1905
Morphology and appearance
The Ara macaws are large parrots ranging from 46–51 cm (18–20 in) in length and 285 to 287 g (10 oz) in weight in the chestnut-fronted macaw to 90–95 cm (35–37 in) 1708 g (60 oz) in the green-winged macaw. The wings of these macaws are long and narrow which is typical for species of parrot which travel long distances in order to forage. They have a massive downward curved upper mandible and a patch of pale skin around the eye that extends to base of the beak. The skin patch bears minute feathers arranged in lines that form a pattern over the otherwise bare skin in all species of the genus except the scarlet macaw in which the skin is bare. In most species the bill is black, but the scarlet macaw and green-winged macaw have a predominantly horn coloured upper mandible and a black lower one.
The colours in the plumage of the Ara macaws are spectacular. Four species are predominately green, two species are mostly blue and yellow, and three species (including the extinct Cuban macaw) mostly red. There is no sexual dimorphism in the plumage, and that of the juveniles is similar to adults, although slightly duller in some species.
Distribution and habitat
The Ara macaws have a Neotropical distribution from Mexico to Argentina. The centre of Ara distribution is the Amazon Basin and the Panama–Colombia border region; each with as many as four species found together (marginally five where the military macaw approach the western Amazon). Seven species are found in Bolivia, but no single locality in that (or any other) country surpasses four species. The most widespread species, the scarlet macaw, is (or was) distributed throughout large parts of Central America and the Amazon. On the other hand the blue-throated macaw and the red-fronted macaw have tiny distributions in Bolivia. The overall range of many species and the genus as a whole has declined in historical times due to human activities. The military macaw is distributed from northern Mexico to northern Argentina, but the distribution is discontinuous, with populations in Mexico, a large gap, then a population in the Venezuelan Coastal Range and a population along the Andes from western Venezuela to northern Argentina. The blue-and-yellow macaw was expiated from Trinidad in the 1960s, as well as retreating from northern Argentina, and several species apparently went extinct in the islands of the Caribbean.
The Ara macaws are generally fairly adaptable in their habitat requirements; this reaches its extreme in the scarlet macaw, which as suggested in its widespread distribution, uses most habitat types from humid rainforest to open woodlands to savannah. The only requirement is sufficient large trees, which is where they obtain their food and breeding holes. The other species are slightly more narrow in their habitat choices, but the need for large trees is universal. The blue-throated macaw generally inhabits forest "islands" in the savanna, and the red-fronted macaw prefers arid scrub and cactus woodland.
Within their range, birds may travel widely seasonally in search of food. They do not undertake large scale migrations, but instead more local movements amongst a range of different habitats.
Feeding and diet
Like all macaws and most parrots seeds and fruit are the major part of the diet of the genus Ara. The particular species and range of diet varies from species to species. Unlike many birds macaws are seed predators not seed dispersers, and use their immensely strong beaks to open even the hardest shells. Their diet overlaps with that of some monkey species; in one study of green-winged macaws in Venezuela they shared many of the same trees as bearded sakis, although in some cases they ate the seeds at an earlier stage of ripeness than the sakis, when they contained more poison. Macaws, like other parrots, may consume clay to absorb toxic compounds produced by some poisonous seeds they eat. As well, the toxic compounds of some foods may be neutralized by compounds, such as tannins, found in other foods consumed at the same time.
Like almost all parrots, the Ara macaws are cavity nesters. The majority of species nest in cavities in trees, either live or dead. Natural holes in trees may be used, particularly those in dead trees, otherwise holes created by other species; in Mexico military macaws still use the cavities excavated by the now critically endangered imperial woodpecker. In addition to nesting in trees the military macaw and green-winged macaw will also nest in natural fissures in cliffs. This nesting habitat is the only one used by the red-fronted macaws, as sufficiently large enough trees are absent in its arid range.
|Common and binomial names||Image||Description||Range|
|Great green macaw
or Buffon's macaw
||85–90 cm (33–36 in) long. Mostly green, red on forehead, green and blue wings||Central and South America, from Honduras to Ecuador|
or blue-and-gold macaw
||80–90 cm (31.5–35.5 in) long. Mostly blue back and yellow front. Blue chin and green forehead. The upper zone of the bare white skin around each eye extending to the beak is patterned by lines of small dark feathers.||Panama, Colombia through to south-central Brazil.|
or red-and-green macaw
||90 cm (36 in) long. Mostly red, with blue and green wings. The bare white skin around each eye extending to the bill is patterned by lines of small red feathers.||South America, from Colombia through to northern Paraguay (formerly northern Argentina)|
||75–85 cm (30–34 in) long. Blue upperparts and mostly yellow lowerparts, blue throat. Areas of pale skin on the sides of the face are covered with lines of small dark-blue feathers, with pinkish bare skin at the base of the beak.||North Bolivia|
||81–96 cm (32–36 in) long. Mostly bright red, with red, yellow and blue in the wings. There is bare white skin around the each eye extending to the bill.||Mexico to Colombia and the Amazon Basin.|
||70 cm (28 in) long. Mostly green, red forehead||Discontinuous distribution in Mexico and along the Andes from Venezuela to north Argentina.|
||55–60 cm (21.5–23.5 in) long. Mostly green. red forehead and red patch over the ears, pinkish skin on the face, red at bend of wings, blue primary wing feathers||Central Bolivia|
or severe macaw
||46 cm (18 in) long. Mostly green, chestnut forehead, red at bend of wings||Panama and South America in the Chocó and Amazon Basin|
Extinct ca. 1885
||50 cm (20 in) long. Red forehead fading to orange and then to yellow at the nape of the neck, dark brown bill paler at the tip; orange face, chin, chest, abdomen and thighs; upper back mainly brownish red, and the rump and lower back blue; brown, red and purplish-blue wing feathers; upper surface of the tail was dark red fading to blue at the tip, and brownish red underneath.||Extinct - formerly endemic on Cuba and probably also on Isla de la Juventud (previously called the Isle of Pines).|
|†Saint Croix macaw
|Unknown appearance||Only known from sub-fossil bones found at two archeological sites.||Extinct - Saint Croix, U.S. Virgin Islands and central Puerto Rico|
|†Lesser Antillean macaw
or Guadeloupe macaw
||Tail feathers 15–20 inches long. Similar colour as the scarlet macaw, but smaller with an entirely red tail. Known from subfossils and descriptions.||Extinct - Guadeloupe|
Hypothetical extinct Ara
Macaws are known to have been transported between the Caribbean islands and from mainland South America both in historic times, by Europeans, and prehistoric times, by Paleoamericans. Parrots were important in the culture of native Caribbeans, were traded between islands, and were among the gifts offered to Christopher Columbus when he reached the Bahamas in 1492. It is therefore difficult to determine whether or not the numerous historical records of macaws on these islands mention distinct, endemic species, since they could have been escaped individuals or feral populations of foreign macaws of known species, that had been transported there. As many as thirteen extinct macaws have at times been suggested to have lived on the islands until recently. Only three endemic Caribbean Ara macaw species are known from physical remains; the Cuban macaw (Ara tricolor), is known from nineteen museum skins and subfossils, the Saint Croix macaw (Ara autochthones) is only known from subfossils, and the Lesser Antillean macaw (Ara guadeloupensis) is known from subfossils and reports. No endemic Caribbean macaws remain today, and they were likely all driven to extinction by humans, some in historic, and others in prehistoric times.
In addition to the three species known from remains, several hypothetical extinct Ara macaws were only based on contemporary accounts, but are considered dubious today. Many of these were named by Walter Rothschild in the early 20th century, who had a tendency to name species based on little tangible evidence. Among others, the red-headed macaw (Ara erythrocephala) and Jamaican red macaw (Ara gossei) were named for accounts of macaws on Jamaica, the Martinique macaw (Ara martinica) was from Martinique island, and the Dominican green-and-yellow macaw (Ara atwoodi) was supposed to come from Dominica island. The violet macaw (Anodorhynchus purpurascens) is now thought to have been incorrectly based on the Guadeloupe amazon (Amazona violacea).
Other species have been mentioned as well, but many never received binomials, or are considered junior synonyms of other species. Woods and Steadman defended the validity of most named Caribbean macaw species, and believed each Greater and Lesser Antillean island had their own endemic species. Olson and Maíz doubted the validity of all the hypothetical macaws, but suggested that the island of Hispaniola would be the most likely place for another macaw species to have existed, due to the large land area, though no descriptions or remains of such are known. They suggested such a species could have been driven to extinction prior to the arrival of Europeans. The prehistoric distribution of indigenous macaws in the Caribbean can only be determined through further palaeontological discoveries.
|Hypothetical extinct species|
|Common and binomial names||Image||Description||Range|
|†Jamaican Green-and-yellow macaw
or red-headed green macaw
||Length unknown. Red head, bright green body, blue wings and greater coverts. scarlet tail and blue on top, whereas the tail and wings were intense orange-yellow underneath||Jamaica|
|†Jamaican red macaw
or Gosse's macaw
||Length unknown. Similar to the Cuban red macaw. Major difference: Yellow forehead.||Jamaica|
||Length unknown. Blue with an orange-yellow chest.||Martinique|
|†Dominican green-and-yellow macaw
|Length unknown. Green, yellow and red..||Dominica|
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- Norconk, Marilyn A.; Wertis, Catherine; Kinzey, Warren G. (1997). "Seed predation by monkeys and macaws in eastern Venezuela: Preliminary findings". Primates 38 (2): 177. doi:10.1007/BF02382007.
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- "Species factsheet: Ara glaucogularis". BirdLife International (2008). Retrieved 24 July 2008.
- "Species factsheet: Ara militaris". BirdLife International (2008). Retrieved 24 July 2008.
- "Species factsheet: Ara rubrogenys". BirdLife International (2008). Retrieved 24 July 2008.
- Olson, Storrs L.; Edgar J. Máiz López (2008). "New evidence of Ara autochthones from an archeological site in Puerto Rico: a valid species of West Indian macaw of unknown geographical origin (Aves: Psittacidae)" (PDF). Caribbean Journal of Science 44 (2): 215–222.
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- Williams, Matthew I.; David W. Steadman (2001). "The historic and prehistoric distribution of parrots (Psittacidae) in the West Indies". In Woods, Charles A. and Florence E. Sergile (eds.). Biogeography of the West Indies: Patterns and Perspectives (pdf) (2nd ed.). Boca Raton, Florida: CRC Press. pp. 175–189. ISBN 0-8493-2001-1.
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- Olson, S. L.; Suárez, W. (2008). "A fossil cranium of the Cuban Macaw Ara tricolor (Aves: Psittacidae) from Villa Clara Province, Cuba". Caribbean Journal of Science. 3 44: 287–290.
- "Species factsheet: Ara erythrocephala". The Extinction Website (2008). Archived from the original on 13 October 2008. Retrieved 4 October 2008.
- "Species factsheet: Ara gossei". The Extinction Website (2008). Archived from the original on 12 October 2008. Retrieved 4 October 2008.
- "Species factsheet: Ara martinica". The Extinction Website (2008). Archived from the original on 2 October 2008. Retrieved 5 October 2008.
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