Blue-throated Macaw
Ara glaucogularis
Large macaw endemic to flooded grasslands of El Beni, Bolivia (Llanos de Moxos). Breeds in cavities in tall palms, and threatened by habitat loss. Most of the population is highly localized into a few breeding and foraging localities where grassland is less impacted by grazing. From sympatric (and much more common) Blue-and-yellow Macaw by blue throat and more extensive feathering on face.
识别特征
The blue-throated macaw is about 85 cm (33 in) long including the length of its tail feathers and has a wingspan of approximately three feet or 90 cm. It weighs about 900 g (32 oz) to 1,100 g (39 oz). There is little easily observable sexual dimorphism; however, males tend to be a little bigger than females with approximate masses of 750 g and 950 g respectively.Upperparts are turquoise-blue, slightly duller on crown and brighter on rump. Underparts largely bright yellow but the vent is pale blue. It has a bare facial patch obscured by blue feather-lines merging into a blue lower cheek and throat, separated from its crown by a narrow yellow stripe and bare pink skin around base of the large, black bill. On the face there is a sparsely feathered patch of skin near the base of the large dark-colored bill that has 5 or 6 horizontal stripes of blue feathers which are unique for every blue-throated macaw and can be used to individually identify adults.<p>The adults have yellow irises and the juveniles have brown irises. The eye color of a nestling is initially black and changes to brown soon after the eyes open. Between one and three years old, the eyes will turn grey, then white. As the macaw matures, the iris turns yellow and the amount of gold increases with age after 10 years. Elderly macaws show a ring of dark grey surrounding the pupil where the iris has become thinner and the back of the retina shows through. It can be separated from the slightly larger blue-and-yellow macaw by the blue (not black) throat, the blue (not green) crown and the lack of contrast between the remiges and upperwing coverts.
分类信息
Ara is from a Tupi Indian word for macaw; glauco (glaucous Latin for greyish-blue or green) + gularis (Latin: throat). The Blue-throated macaw is one of 8 extant species (and a few extinct species) in genus Ara of large long-tailed parrots collectively called macaws. The genus Ara is one of six genera of Central and South American macaws in the tribe Arini, which also includes all the other long-tailed New World parrots. Tribe Arini together with the short-tailed Amazon and allied parrots and a few miscellaneous genera make up subfamily Arinae of Neotropical parrots in family Psittacidae of true parrots.<p>The blue-throated macaw was originally thought to be a subspecies (Ara ararauna caninde) of the similar-looking blue-and-yellow macaw.
- 学名
- Ara glaucogularis
- 命名信息
- Dabbene, 1921
- 目
- Psittaciformes
- 科
- Psittacidae
- 属
- Ara
分布与栖息地
The blue-throated macaw lives in the Llano de Moxos of the Beni Department of Bolivia, nesting in "Islas" (islands) of palm trees that dot the level plains. It is not a forest-dwelling bird. This species is one of the rarest in the world. There are two areas inhabited by two sub-populations of Ara glaucogularis: one is to the northwest of Trinidad (the capital city of Beni), and the other is to the south of Trinidad. This complex landscape consists of grasslands, marshes, forest islands, and corridors of forests along waterways. They occur most often between the elevations of 200 and 300 m.
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Grauer's Broadbill
Pseudocalyptomena graueri
A unique dumpy green flycatcher-like broadbill with a buffy crown, a black eye-stripe, and a powder-blue throat and vent. Juvenile duller. A scarce resident found singly and in pairs in the lower canopy and at middle levels of primary Albertine Rift Forest between 1760 and 2500 meters of elevation, preferring the edges of clearings. Highly localized, occurring in two isolated populations in Bwindi (Uganda) and Itombwe/Kahuzi (Democratic Republic of Congo), and inexplicably absent from ideal intervening habitat. May join flocks, but inconspicuous unless calling its soft high-pitched tinny “tsit-tsit,” repeated multiple times, and a rapid “tseet-tsit-tsit-sit-sit-it-it” in flight.
Pacific Swallow
Hirundo javanica
Common swallow of Southeast Asia and the Pacific, often in cities and towns as well as above fields, lakes, and forests. Adult iridescent blue above and grayish buff below, with orangish throat and forehead. Similar to Barn Swallow, which has longer outer tail feathers and a dark line separating the throat and breast, lacking in Pacific. Frequently perches on telephone lines, often with other swallow species.
Chestnut-headed Sparrow-Lark
Eremopterix signatus
A typical sparrow-lark in which males are colorful and well-marked, and females rather drab. The male has variable black and chestnut markings on the face surrounding a bright white cheek that continues as a stripe down the side. Females are plain, but show a rufous eyebrow and a black mark on the belly. Found in dry and open habitats including desert, grassland, and savanna, usually in flocks. Details of the plumage always distinguish males, but females can be tricky; they are most similar to female Fischer’s Sparrow-Lark, but have very little overlap in range. The call, frequently given in flight, is a simple chirping.
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