Violaceous Jay
Cyanocorax violaceus
Large, dark jay with vibrant blue plumage and a black head and bib. Frequents a variety of open habitats, including forest edges, gardens, and agricultural areas. Often particularly common in vegetation along rivers and other waterways. Distinguished from similar Purplish Jay by its brighter blue plumage and contrasting pale nape. Also listen for a high-pitched, piercing “jeer.”
识别特征
This is a medium-large jay with dull violet-blue plumage and a striking dark face and throat. The purplish jay (with which it overlaps in southeastern Peru and in northern Bolivia) is duller (more purplish or brownish blue, less violaceous blue) and the nape is not paler than the back. In eastern Colombia and southern Venezuela, the azure-naped jay is distinguished by its pale iris, white undertail coverts and tip to the tail, paler nape, and short frontal crest. The violaceous jay is 33–38 cm (13–15 in) long and weighs 262 grams (9.2 ounces).)
分类信息
- 学名
- Cyanocorax violaceus
- 命名信息
- Du Bus de Gisignies, 1847
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Cyanocorax
分布与栖息地
The range of the violaceous jay is the southwest and northwest Amazon Basin, from northern Bolivia, through Amazonian eastern Peru and Ecuador, Amazonian Colombia, and the Orinoco River Basin and beyond into northern Venezuela. The range is east of the Andes cordillera, except in the north in Colombia and Venezuela. In southwest Guyana, (the southwest Guiana Shield), the range borders Roraima state, Brazil and the Amazon River, (Rio Negro), tributary, the south-flowing Branco River of central Roraima.<p>In Brazil's western Amazon Basin, the violaceous jay is found in Roraima, Amazonas, and Acre state, the west of North Region, Brazil.
- 迁徙
- Resident species
行为
The violaceous jay is omnivorous, mainly consuming fruits, insects, and bird and reptile eggs. It is also known to take small lizards as well.<p>Little is known in any detail about the violaceous jay's life history. Violaceous jays in Venezuela forage chiefly in the middle and upper canopy (above 18 meters) in a mature tropical evergreen rainforest. They take food items by hopping along limbs and gleaning for prey. It forages in flocks in forest canopy, and rarely lingers in one spot for long. These flocks often are noisy, but like other jays, the violaceous jay can be quiet and inconspicuous at times. They are known to frequently mob potential predators.
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Slaty-backed Gull
Larus schistisagus
Thickset, short-winged, pot-bellied gull. Adult has dark gray back and wings, intense pink legs, and an especially large white “crescent” (white tertial edges) near the wingtips when perched. Breeding adult white-headed; nonbreeding birds have variably heavy brown streaking on the head and upper breast. Takes four years for immatures to progress from mostly brown to fully white and gray adult plumage; intermediate plumages are often mottled and messy. Often looks rather frosty by the first winter; starts to develop a gray back and whitish eye in its second year. Primarily an Asian species, found in coastal regions from Japan and South Korea to Russia. Regularly occurs in western Alaska, but very rare elsewhere in North America.
Cozumel Emerald
Cynanthus forficatus
Only on Cozumel Island, Mexico, where it is usually the most frequently encountered hummingbird. Feeds low to high on a variety of flowers, preferring forest edge, gardens, and other semi-open habitats. Male is stunning, emerald-green with a long, deeply forked tail. Female has distinctive broad dark facemask, rather long forked tail. No similar species on the island (Canivet’s Emerald occurs on the Yucatan mainland).
Smith's Longspur
Calcarius pictus
Sparrowlike ground dweller; crouches low to the ground and walks with pattering footsteps. Breeding male is a unique deep yellow-orange with black-and-white head pattern. Females and nonbreeding birds are more subtle but typically buffier than other longspurs. Also look for long wingtips, thin white eyering, and blurry streaks below. Breeds on Arctic tundra. In winter, look for small flocks in fields with short grass and exposed soil. Not found in mixed flocks. Rattle call similar to Lapland Longspur.
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