Azure-rumped Tanager

Poecilostreptus cabanisi

Quick Facts

Endémique
  • Scientific Name: Poecilostreptus cabanisi
  • Spanish Name: Tangara de Cabanis
  • Family: Thraupidae
  • Known Nicknames: Cabanis's Tanager, Tangara de Cabanis
  • Average Length: 14 cm / 5.5 in
  • Average Weight: 23–28 g / 0.81–0.99 oz
  • Wingspan: 20–24 cm / 7.9–9.4 in
  • Key Feature: Bright azure-blue rump, turquoise-green plumage, and black facial mask
  • Primary Diet: Omnivorous (primarily frugivorous and insectivorous)
  • Range: Pacific slope of the Sierra Madre in Chiapas (Mexico) and western Guatemala
  • Habitat: Humid premontane forest canopy, cloud forests, and shaded coffee plantations
  • Social Structure: Social (pairs, small family groups, or mixed-species foraging flocks)
  • Nesting/Breeding: Cup-shaped nest in tree branches or epiphyte clumps
  • Conservation Status: Endangered (EN)
  • Population Trend: Decreasing

The Azure-rumped Tanager (*Poecilostreptus cabanisi*) is an endangered, breathtakingly vibrant songbird native only to the humid canopy forests and shade-coffee plantations of the Sierra Madre mountains in Mexico and Guatemala. This stunning avian gem is immediately recognizable by its brilliant, namesake azure-blue rump, which contrasts beautifully with a shimmering palette of turquoise, sky-blue, and yellowish-green plumage, all accented by a subtle black mask and delicate dark speckling across its back and breast. A highly specialized canopy dweller, this rare species is celebrated for its acrobatic foraging behavior, often hanging upside down to feast on wild figs and small insects. With its extremely restricted geographic range and dazzling coloration, the Azure-rumped Tanager stands as both a magnificent symbol of Mesoamerican biodiversity and a critical priority for conservationists striving to protect its fragile mountain habitat.

Faits amusants

This acrobatic canopy-dweller is famous for its gravity-defying dining habits, frequently hanging completely upside down like a gymnast to pluck wild figs from precarious branches. When it isn't performing aerial stunts for food, it acts as a social trendsetter, often serving as the central "nuclear" leader that guides entire mixed-species foraging parties through the cloud forest. To top off its quirky lifestyle, this tanager has a dramatic nesting preference, often building its mossy cup nests on steep cliffs right next to rushing waterfalls, utilizing the constant mist to keep its eggs perfectly hydrated.

Habitats et répartition

This species has an extremely restricted geographical range, localized entirely within the Sierra Madre de Chiapas in southeastern Mexico and the adjacent highlands of southwestern Guatemala. Within this narrow Mesoamerican corridor, its distribution is highly fragmented, making it a rare and localized endemic of the region.

Its primary habitats are wet, humid montane evergreen forests and cloud forests, typically at elevations ranging from 800 to 1,900 meters above sea level. The species also utilizes mature secondary forests and traditional shade-grown coffee plantations, relying heavily on the canopy of these environments for foraging on fruits and insects.

Comportements & Reproduction

This species typically lives in pairs or small family groups of three to five individuals, occasionally joining mixed-species foraging flocks in the canopy. They are highly active and agile, moving through dense foliage to feed on fruits and insects. During the breeding season, pairs exhibit territorial behavior, defending their nesting areas through vocalizations and physical displays.

Monogamous pairs initiate breeding between April and June, aligning with the onset of the rainy season. They construct cup-shaped nests well-hidden among epiphytes, mosses, or dense foliage high in the forest canopy. The female typically lays a clutch of two eggs, and while she performs the majority of the incubation, both parents actively participate in feeding and defending the chicks, a biparental strategy crucial for offspring survival in their restricted cloud forest habitat.

Alimentation

The Azure-rumped Tanager (*Poecilostreptus cabanisi*) is an omnivorous bird whose diet primarily consists of a diverse array of small fruits, berries, and insects. It heavily relies on the fruits of *Ficus* (fig) trees, *Cecropia*, and plants from the Melastomataceae family, making it a vital seed disperser within its threatened cloud forest habitat. To supplement its fruit intake with essential proteins, this species actively hunts for spiders, beetles, caterpillars, and other small invertebrates by gleaning them from leaves, mossy branches, and bark. An interesting aspect of its feeding behavior is its remarkably acrobatic foraging style, as it frequently hangs completely upside down to pluck hard-to-reach berries or snatch insects hiding on the undersides of leaves. Additionally, these tanagers often join mixed-species foraging flocks, working cooperatively with other bird species to locate rich food sources throughout the high forest canopy.

Couleurs

The Azure-rumped Tanager features a brilliant azure-blue rump and pale turquoise underparts contrasted by a yellowish-green head and back heavily streaked with black. It has dark, scale-like spotting on its breast, a small black facial mask, and black wing and tail feathers edged in blue. This combination of bright blue highlights and heavily streaked upperparts provides both species-recognition signals and effective dappled camouflage within its humid forest canopy habitat.