Blue-black Grosbeak

En bref

  • Scientific Name: Cyanocompsa cyanoides
  • Spanish Name: Picogrueso negro azulado
  • Family: Cardinalidae
  • Known Nicknames: Blue-black Grosbeak, Ultramarine Grosbeak
  • Average Length: 15–17 cm / 5.9–6.7 in
  • Average Weight: 27–38 g / 0.95–1.34 oz
  • Wingspan: 22–25 cm / 8.7–9.8 in
  • Key Feature: Deep blue-black plumage in males with a massive, conical silver-gray bill
  • Primary Diet: Primarily Granivore, also Frugivore and Insectivore
  • Range: Southern Mexico through Central America to northern South America (west of the Andes)
  • Habitat: Dense understory of lowland and foothill tropical forests, often near water
  • Structure sociale : Solitaires ou en couples
  • Nesting/Breeding: Open cup nest built in a fork of a shrub or small tree
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Blue-black Grosbeak (*Cyanocompsa cyanoides*) is a striking songbird of Central and South American lowland forests, renowned for its deep, velvety plumage that appears almost entirely black in low light but reveals an intense, metallic blue sheen in direct sunlight. Males are unmistakable with their massive, conical silver-blue bill, which they use to crack hard seeds and large insects, while females are a warm, rich cinnamon-brown, offering excellent camouflage. A truly unique feature is the male’s song—a series of clear, whistled notes that often ends with a distinctive, buzzy trill, making it one of the most audible and charismatic birds in its dense, understory habitat.

Faits amusants

Despite its name, the male Blue-black Grosbeak isn't truly black; in bright sunlight, its plumage shimmers with an iridescent, deep navy blue that can appear electric. One of its quirkiest behaviors is a "wing-flash" display, where it rapidly flicks open and shut its wings to startle insects into moving, making them easier to catch. It also has a surprisingly loud, sweet, and complex song for a bird of its size, often mimicking other species, and it will sometimes sing while holding a large seed in its beak, a feat of avian multitasking.

Habitats et répartition

The Blue-black Grosbeak inhabits dense, humid lowland forests, forest edges, and tall secondary growth, often near watercourses like rivers and streams. It is typically found from sea level up to around 1,200 meters in elevation, favoring the understory and midstory of mature tropical rainforests. Its distribution spans from southern Mexico through Central America (including Belize, Guatemala, Honduras, Nicaragua, Costa Rica, and Panama) and across much of northern and western South America, including Colombia, Venezuela, Ecuador, Peru, Bolivia, the Guianas, and western Brazil. It is generally resident year-round within this range, though local movements may occur in response to seasonal flooding or food availability.

Comportements & Reproduction

The Blue-black Grosbeak is generally solitary or found in pairs, with a social structure centered on a monogamous bond during the breeding season. Males establish and defend a territory through song, often perching conspicuously to attract a female. Courtship involves the male performing a fluttering display flight and offering food to the female, a behavior that strengthens the pair bond. The female builds a cup-shaped nest in dense vegetation, typically low in a shrub or tree. She incubates a clutch of two to three pale blue eggs with faint speckling for about 12 to 14 days, during which the male provides food for her. After hatching, both parents aggressively defend the nest and feed the chicks, which fledge approximately 10 to 12 days later. A unique reproductive strategy is the male’s delayed plumage maturation; young males retain a brown, female-like appearance for their first year, which may reduce aggression from older males and allow them to establish territories without conflict, though they do not typically breed until the following season.

Alimentation

The Blue-black Grosbeak is primarily a granivore, with seeds—especially those of grasses, bamboo, and forbs—making up the bulk of its diet, but it is also an opportunistic frugivore that consumes a variety of small fruits and berries. Interestingly, it frequently supplements its plant-based meals with a significant amount of protein by actively hunting insects, including beetles, caterpillars, and grasshoppers, often gleaning them from foliage or catching them in mid-air. Another notable dietary behavior is its reliance on large, powerful bills to crack open hard seeds that smaller finches cannot manage, and it has been observed visiting mineral-rich clay licks in the Amazon, possibly to aid in digestion or neutralize toxins from unripe fruits.

Couleurs

The male Blue-black Grosbeak is a deep, almost velvety indigo-black overall, with brighter, vivid cobalt-blue highlights on the forehead, supercilium, and shoulder patches, while the female is a warm cinnamon-brown. Both sexes have a massive, conical silver-gray bill and lack any distinct wing bars or streaking, with the male’s dark plumage providing effective camouflage in dense, shadowy forest understory.