Red-throated Caracara
Ibycter americanus
Large, raucous forest raptor. Unmistakable by virtue of its size, social habits, and loud, incessant calls. At a distance, note slow flight and contrasting white belly. Found in regions of continuous lowland forest; does not occur in extensively disturbed areas. Mostly observed in the canopy and mid-story where it knocks down wasp and bee nests to the ground to feed on the larvae; also consumes fruit. Groups will approach and mob humans passing through their territory.
识别特征
Males average 20.1 in (51 cm) long, while females average 22.1 in (56 cm); they are distinguished from the black caracara by larger size and plumage that is mainly black, with the belly, tail feathers, and undertail feathers being white. Both their faces and throats are bare with a few black feathers scattered on the throat; the exposed skin is red. Both male and female red-throated caracaras are similar in appearance. Males have a wing length of 35.55 cm, a tail length of 24.96 cm, a bill length of 2.5 cm, and a tarsus length of 5.41 cm. Females have a wing length of 35.93 cm, a tail length of 25.31 cm, a bill length of 2.58 cm, and a tarsus length of 5.62 cm.
分类信息
The red-throated caracara was described by the French polymath Georges-Louis Leclerc, Comte de Buffon in 1770 in his Histoire Naturelle des Oiseaux from a specimen collected in Cayenne, French Guiana. The bird was also illustrated in a hand-coloured plate engraved by François-Nicolas Martinet in the Planches Enluminées D'Histoire Naturelle which was produced under the supervision of Edme-Louis Daubenton to accompany Buffon's text. Neither the plate caption nor Buffon's description included a scientific name but in 1783 the Dutch naturalist Pieter Boddaert coined the binomial name Falco americanus in his catalogue of the Planches Enluminées.<p>The red-throated caracara was for many years placed with the black caracara in the genus Daptrius but based on a molecular genetic study published in 1999 it was moved to be the only species in the resurrected genus Ibycter that had been introduced by the French ornithologist Louis Pierre Vieillot in 1816. The species is monotypic. The genus name Ibycter is from the Ancient Greek ibuktēr meaning "singer of war-songs".
- 学名
- Ibycter americanus
- 命名信息
- (Boddaert, 1783)
- 目
- Falconiformes
- 科
- Falconidae
- 属
- Ibycter
分布与栖息地
This species inhabits the humid lowland forests of Brazil, Bolivia, Colombia, Costa Rica, El Salvador, Ecuador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Peru, and Venezuela. The slow flight of the red-throated caracara makes it suited it to fly in the understory of the forest where the vegetation is thin. The sparse vegetation gives the red-throated caracara greater visibility to spot food and predators. The ornate hawk-eagle and the black-and-white hawk-eagle are predators of the red-throated caracara.
- 迁徙
- Resident species
行为
The red-throated caracara hunts in the canopy and the understory of the lowland jungle, foraging mainly for insect nests. Most red-throated caracaras hunt silently, but occasionally make soft caws and sometimes hunt in groups. When hunting in groups, one or two individuals scout for predators in the canopy, while the remaining flock hunts in the understory. The red-throated caracara is highly territorial, with four to eight individuals in a group.<p>The diet consists mainly of wasp and bee larvae, though it will eat mature insects and also forage on fruits and berries found in the humid subtropical and tropical lowlands, and mountainous regions of its Central and South American habitat. Biodiversity of the forest ecosystem is paramount for the birds' special diet, since wasps and bees often make their nests in hollows or amongst branches of mature trees found in old-growth forests. Deforestation and intensive agriculture practices severely hamper the red-throated caracara's population, likely accounting for its rare sightings today. After the 1950s, both its population and range rapidly declined in Costa Rica, Honduras, Panama, Ecuador, and French Guiana, causing the species to be placed on the World Wildlife endangered list. Until 2013, very little was known of the red-throated caracara's feeding behavior until a team of Canadian biologists from the University of Simon Fraser spent months researching the birds using camera surveillance at the Nouragues Field Station in French Guiana. The scientific footage shows the birds using a rapid-fire “fly-by” aerial-diving attack strategy to knock nests down onto the forest floor, while skillfully evading most wasp stings. The birds use air squadron precision, repeatedly diving then scooping upward, to drive off or confuse angry defender swarms around the hive. Researchers also found that neotropical defender wasps eventually abandon their damaged hives and retreat, alongside smaller worker wasps, to rebuild a new nest site. All predators evolve ways of hunting or trapping prey. Biologist Sean McCann observed that these intelligent birds have a highly specialized predation trait in response the wasps’ behavior to cut losses and rebuild elsewhere. The predation impact on the numbers of prey populations is undetermined. Furthermore, it is not clear how much the red-throated caracara's primary food source, wasp larvae, places constraints on the birds' ability to survive since their complex predation is interlinked with neotropical wasp behavior. Knowledge of the birds' chemical resistance to stings is also unknown. Chemical traces found on the birds’ feet are similar to those secreted from Azteca ants, likely contacted along tree branches and nest sites which both species inhabit.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Great Frigatebird
Fregata minor
A large black seabird that holds its wings in a distinctive crook. The long, forked tail may appear pointed when folded. Males are all black with a red throat pouch. Females have a white breast. Immatures have a white head and breast. All-dark plumage of male and lack of a pale “armpit” in female and immature separate this species from Lesser and Christmas Island Frigatebirds. Separation from Magnificent Frigatebird can be difficult; note pale wing panel in males and indistinct pale throat in females (Magnificent females have a clean all-dark head). Nests in trees and bushes on tropical islands. Often seen flying along the shoreline, sometimes very high, and sometimes inland. Chases other seabirds to steal their prey.
Green Junglefowl
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Fancy-looking “chicken” endemic to Java and the Lesser Sundas, from Bali east to Alor. Also introduced to the Cocos Islands. Dark, iridescent male is distinctive, with dark-centered orange and yellow feathers on the back and wings. Also note his bright blue-and pink comb and large red wattle. Female is dull brown with dark spotting, and also has a blackish tail and pale pinkish face; compare with female Red Junglefowl, which is warmer-colored overall, with more orangeish tones. Inhabits open forests, forest edges, and scrub from lowlands into foothills. Scratches about on the ground singly, or in small groups. Gives an incredibly hoarse crow: “krewwarewwah!”
Giant Laughingthrush
Ianthocincla maxima
Large brown laughingthrush with an orange face and white-spotted back and wings. Like many other laughingthrushes, often forages deep in cover, but will venture out onto trails and openings occasionally. Repetitive song emanates from middle-to-high-elevation forests. Usually seen in pairs or small groups.
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