Bare-throated Bellbird

Quick Facts

  • Scientific Name: Procnias nudicollis
  • Spanish Name: Campanero barbudo
  • Family: Cotingidae
  • Known Nicknames: Bare-throated Bellbird, Araponga
  • Average Length: 27–29 cm / 10.6–11.4 in
  • Average Weight: 180–230 g / 6.3–8.1 oz
  • Wingspan: N/A
  • Key Feature: Naked, warty, turquoise-blue throat and face skin in males
  • Primary Diet: Primarily Frugivore
  • Range: Eastern Paraguay, northeastern Argentina, and southeastern Brazil
  • Habitat: Humid Atlantic Forest, especially montane and lowland forest canopy
  • Social Structure: Solitary or in loose aggregations at fruiting trees
  • Nesting/Breeding: Open cup nest in a tree fork
  • Conservation Status: Vulnerable (VU)
  • Population Trend: Decreasing

The Bare-throated Bellbird (*Procnias nudicollis*) is a striking songbird native to the Atlantic forests of South America, renowned for its explosive, metallic *"bonk"* call that echoes through the canopy like a hammer striking an anvil. The male is a dazzling spectacle: entirely snow-white plumage contrasts sharply with a vivid, naked cobalt-blue throat and a black, warty patch of skin around the eye, while the female is a more cryptic olive-green with yellow streaking below. Its most unique feature is the male’s hypertrophied trachea and specially adapted ribcage, allowing it to produce one of the loudest bird calls on Earth—often exceeding 125 decibels—delivered with a dramatic, head-jerking motion that makes it seem almost mechanical in performance.

Fun Facts

The male’s ear-splitting, metallic call, often compared to a hammer striking an anvil, can reach 125 decibels—louder than a rock concert—and is used to attract females from over a kilometer away. To produce this sound, it contorts its head dramatically, exposing the vivid blue, featherless throat patch that inflates and deflates like a balloon. Despite its deafening voice, the bird is notoriously shy and difficult to spot, often perching motionless high in the canopy. Females lack both the loud call and the bare throat, building cup-shaped nests entirely alone and raising chicks without any male assistance.

Habitats & Distribution

The Bare-throated Bellbird inhabits humid primary and secondary forests, including Atlantic Forest remnants, montane rainforests, and forest edges. It is most often found in the canopy and subcanopy of tall, mature forests, though it may venture into adjacent clearings or selectively logged areas. Its geographical range is restricted to southeastern Brazil, extending from southern Bahia and Minas Gerais south through Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, and into extreme northeastern Argentina (Misiones) and eastern Paraguay. It occurs from near sea level up to about 1,500 meters in elevation.

Behaviours & Reproduction

Males are highly territorial and solitary, defending small display perches in the forest canopy where they produce a loud, metallic, three-note call to attract females. During the breeding season, males gather in loose, dispersed leks, but they do not form cooperative groups; instead, they compete acoustically from separate perches. Females visit multiple males to assess calls and visual displays, which include exaggerated head movements and feather ruffling. After mating, the female alone builds a shallow cup nest in a tree fork, incubates the single egg for about 20 days, and feeds the chick solely on fruit and insects until fledging. A unique reproductive strategy is the male’s extreme sexual dimorphism—his bare, turquoise throat and white body contrast starkly with the female’s dull olive plumage—reinforcing a mating system where females choose mates based on vocal performance rather than direct physical confrontation.

Diet

The Bare-throated Bellbird is primarily frugivorous, with fruit making up the vast majority of its diet, especially lipid-rich fruits from trees in the families Lauraceae (like avocados) and Meliaceae. It plays a crucial role as a seed disperser in the Atlantic Forest, swallowing fruits whole and later regurgitating or excreting the seeds far from the parent tree. An interesting aspect of its feeding behavior is that males often establish feeding territories high in the canopy, aggressively defending productive fruit trees from other birds, including other bellbirds. Despite their small size, they can consume relatively large fruits, which they pluck while hovering or perching, and they rarely, if ever, supplement their diet with insects or other animal matter, making them one of the most specialized frugivores among Neotropical birds.

Colors

The male Bare-throated Bellbird is predominantly white, with a sharply contrasting black cap and a striking bare, vivid blue-black throat patch. Females are a cryptic olive-green with yellowish streaking below, lacking the male's bold markings. This sexual dimorphism provides camouflage for the nesting female, while the male's stark white and black pattern aids in visual display within the forest canopy.