Green-billed Toucan

Ramphastos dicolorus

Red-breasted Toucan - Foz Do Iguaçu, Paraná, Brazil

Quick Facts

  • Scientific Name: Ramphastos dicolorus
  • Spanish Name: Tucán de pico verde
  • Family: Ramphastidae
  • Known Nicknames: Red-breasted Toucan
  • Average Length: 40–50 cm / 16–20 in
  • Average Weight: 265–400 g / 9.3–14.1 oz
  • Wingspan: 45–55 cm / 18–22 in
  • Key Feature: Pale greenish-yellow bill and vibrant red lower breast and abdomen
  • Primary Diet: Primarily Frugivorous (also consumes insects and small vertebrates)
  • Range: Southern and Eastern Brazil, Eastern Paraguay, and Northeastern Argentina
  • Habitat: Atlantic Forest, subtropical and tropical moist lowland and montane forests
  • Social Structure: Social (often found in pairs or small family groups)
  • Nesting/Breeding: Tree hollows (often abandoned woodpecker nests)
  • Conservation Status: Least Concern (LC)
  • Population Trend: Decreasing

The Green-billed Toucan (*Ramphastos dicolorus*), also widely known as the Red-breasted Toucan, is a vibrant and charismatic inhabitant of the Atlantic Forest across South America. As one of the smaller members of the *Ramphastos* genus, it is most famously distinguished by its namesake chartreuse or pale green bill, which lacks the dark terminal spot common in its cousins and features a subtle serrated edge perfect for plucking forest fruits. Its plumage is a deep, glossy black that serves as a dramatic backdrop for its most striking features: a bright yellow-orange throat and a broad, fiery crimson patch covering its breast and belly. This combination of a lime-colored beak and its "sunset-colored" chest makes it an unmistakable gem of the canopy, where it uses its agile flight and social nature to navigate the dense woodlands of Brazil, Paraguay, and Argentina.

Fun Facts

The Green-billed Toucan possesses a specialized bill that functions as a thermal radiator, enabling the bird to regulate its body temperature by controlling blood flow to the beak's surface. To conserve space while sleeping in cramped tree cavities, it exhibits a peculiar posture by folding its tail flat against its back and tucking its bill under a wing, resembling a compact ball of feathers. This species is also known for engaging in playful "bill-fencing" matches with peers and a unique feeding ritual where it tosses fruit into the air to catch it at the back of its throat. Despite its bulky appearance, the bill is remarkably lightweight thanks to a hollow, honeycomb-like internal structure made of keratin.

Habitats & Distribution

The distribution of this species is centered in the Atlantic Forest biome of South America, spanning across southeastern and southern Brazil, eastern Paraguay, and the Misiones province of northeastern Argentina. Within this range, it inhabits moist subtropical forests, gallery forests, and humid montane regions. It is particularly notable for its presence in cooler, higher-altitude environments compared to other large toucans, though it can be found from sea level up to approximately 1,500 meters. In these environments, it primarily occupies the canopy and middle strata of primary forests, but it is also frequently seen along forest edges and in secondary growth areas. Its habitat selection is largely driven by the availability of diverse fruit-bearing trees and suitable tree cavities for nesting. While it remains relatively common in certain protected areas, its range is closely tied to the preservation of the remaining Atlantic Forest tracts.

Behaviours & Reproduction

These birds are primarily social, typically observed in pairs or small family groups while foraging through the forest canopy. They engage in frequent social interactions, such as mutual preening and bill-clapping, to strengthen pair bonds. During the breeding season, courtship involves ritualized fruit tossing, where the male offers food to the female to demonstrate his providing capabilities. They are monogamous and establish nests within hollow tree cavities or abandoned woodpecker holes, which they defend territorially against intruders. Reproduction is a cooperative effort, with both parents sharing the responsibilities of incubating the two to four eggs and feeding the altricial chicks. The incubation period typically lasts between 16 and 19 days. After hatching, the young remain in the nest for approximately six to nine weeks, during which time the parents provide a steady supply of fruit and small proteins like insects or lizards. This dedicated biparental care is crucial for the development of the offspring before they fledge and join the larger social group.

Diet

The Green-billed Toucan is primarily frugivorous, subsisting on a wide variety of tropical fruits and berries, with a particular preference for the nutrient-rich fruits of the Euterpe edulis palm and Cecropia trees. While its diet is mostly plant-based, this species is an opportunistic feeder that supplements its nutritional intake with animal protein, including insects, small reptiles, bird eggs, and occasionally small nestlings. An interesting aspect of its feeding behavior is the dexterity with which it uses its serrated bill to pluck fruits from precarious branches before tossing them into the air and catching them at the back of its throat to swallow whole. Due to its remarkably short digestive tract, the bird processes food quickly and excretes seeds intact, making it a crucial seed disperser for many tree species within the Atlantic Forest.

Colors

The Green-billed Toucan possesses a primarily black body contrasted by a vibrant yellow-orange throat and a large, deep red patch across its lower breast and belly. Its signature bill is a distinctive pale lime green with dark serrated markings along the cutting edge. Bare red skin surrounds the eyes, while the dark dorsal plumage serves as effective camouflage within the dense, shaded canopy of the Atlantic Forest.