Rigogolo di Audubon

Identificazione

The male of the species has a black hood, mandible, and throat, as well as a black tail. Wings are black, but the remiges and rectrices (flight feathers) are fringed with white. The secondary coverts form yellow epaulets. The back and vent are yellow washed with olive, and the underside is almost uniformly yellow. Females of this species have a slightly more olive nape and back than the males. The adult female's plumage is similar to the juvenile plumage; however, unlike adults, the wings are dull brown instead of black. In general, immature specimens have the hood; wingbars; remiges; and epaulets of adult specimens. The first-basic plumage retains the darker, greener coloration of the juvenile plumage, however. Molting generally occurs in early autumn, though some specimens have been noted to molt as early as June.<p>The subspecies I. g. dickeyae is of note because of the differences in appearance, behavior, and phylogeny between it and the other subspecies of I. graduacauda. The olive wash is weaker, making the bird more proportionally yellow than others of its species. In addition, the yellow epaulets are diminished in dickeyae, being confined to the lesser coverts. This subspecies is endemic to high altitude pine forests is western Mexico.

Tassonomia

Nome scientifico

Icterus graduacauda

Autorità

Lesson, RP, 1839

Ordine

Passeriformi

Famiglia

Icteridae

Genere

Icterus

Areale e habitat

Migrazione

Resident species

Comportamento

Audubon's oriole inhabits dense evergreen forests and thickets, preferring riparian (riverside) areas. Though it prefers the shade, mating pairs may occasionally spotted foraging in clearings. In flight, it joins mixed-species flocks that include orioles, jays, tanagers, and other birds of similar size. It forages in dense vegetation, often near forest clearings.<p>The nest of the Audubon's oriole is similar in size and construction to those of the hooded and orchard orioles, being approximately three inches in diameter with a similar depth. It resembles a hanging pouch or basket, not as deep as other species'. The rim is firmly woven to the supporting twigs and the entrance is somewhat constricted. The nest itself is usually composed of long grass stems, woven while they are still green and lined with finer grass.<p>A mating pair of orioles usually incubates two broods per year, each consisting of between three and five eggs per brood; however, chicks hatched from the later brood are usually unable to survive the winter. This species' nests are often a popular choice of parasitization by the Brown-headed cowbird.<p>The song of the Audubon's oriole is a series of slow, slurry whistles. Its calls include a nasal "ike, ike, ike" and a whistled "peu".<p>It inserts its bill into soft dead wood or plants and uses its beak to force said plant open to expose insects hiding inside. It feeds on insects, spiders, fruits, and also accepts sunflower seeds from bird feeders.

Conservazione

Tendenza della popolazione

declining