AnimaliaIUCN LCIn Progress Recent Sighting
Trogon melanocephalus
Black-headed Trogon
Gould, 1836
Detailed Texts Multi-lang
The Black-headed Trogon (Trogon melanocephalus) is a medium-sized bird with a characteristic upright posture and contrasting coloration. The adult male is unmistakable: its head, neck, and upper chest are a deep matte black, which contrasts dramatically with a bright, intense yellow belly. Its back and rump gleam with metallic green or blue-green tones depending on the light. Its most distinctive facial feature is a thick ring of bare, pale sky-blue skin around the eye. The underside of the tail is black, with large white panels at the tips of the outer feathers. Females share the yellow belly, but their head and back are a dark slate gray, and their blue eye-ring is much thinner or almost absent.
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Taxonomy
PhylumChordata
ClassAves
OrderTrogoniformes
FamilyTrogonidae
GenusTrogon
Taxonomic AuthorityGould, 1836
Ecology & Status
Origin
Native
Population Trend
Stable
Breeding Season
Dry Season
Trophic Role
Insectivore
Recent Sightings
Yes
Habitat Summary Multi-lang
It is predominantly a species of dry and semi-arid lowlands. It prefers deciduous forests, savannas with scattered trees, forest edges, gallery forests, dense secondary scrub, and mangroves. It avoids dark, dense rainforests. In Costa Rica, it is a classic and iconic inhabitant of the northwestern region (Guanacaste, Nicoya Peninsula) and parts of the northern plains, tolerating hot, dry climates well from sea level up to about 900 meters in elevation.Behaviour Multi-lang
They are solitary birds or travel in pairs. They spend a lot of time sitting silently and motionless on mid-level horizontal branches, carefully watching their surroundings. They have a direct but undulating and silent flight. During the breeding season, males emit a very characteristic territorial call from the canopy: a rhythmic, accelerating, guttural series of notes like 'coo-coo-coo-cwa-cwa-cwa', which echoes widely through the dry forests.Social Activity Multi-lang
They are solitary birds by nature, though they almost always form stable pairs during the breeding season and defend a territory. They do not form flocks or interact socially with other species.Feeding Guild Multi-lang
Omnivore / Hover-gleaner.Trophic Chain Details Multi-lang
Omnivore. Its diet is mixed; they consume a wide variety of small fruits (ficus, wild berries) which they swallow whole, later regurgitating the seeds, making them excellent dispersers. They supplement their diet with large insects (caterpillars, grasshoppers, cicadas, beetles) that they catch in flight or snatch from leaves. Their nests can be raided by arboreal snakes and the adults hunted by forest falcons (Micrastur).Reproductive Behaviour Multi-lang
They are monogamous birds. The pair works as a team to excavate a cavity using their bills. They choose a large black termite mound hanging from a tree, or sometimes wasp nests or rotting wood. They dig an upward-sloping tunnel ending in an oval chamber. The female typically lays 2 to 3 pure white eggs directly on the debris at the bottom (without extra nesting material). Both parents share incubation, which lasts about 18 to 19 days, and collaborate intensely to feed the altricial chicks with insects and fruit until they fledge at about 25 days.Physical Measures
Length (cm)
27.0 - 29.0 cm
Weight (Grams)
60 g - 90 g
Offspring per cycle2 - 3
Sexual DimorphismYes
Lifespan
Sexual Maturity
12 - 24 Months
Gestation / Incubation
18 - 19
Lifespan Estimated
Males7 - 12 Years
Females7 - 12 Years
Sexual Dimorphism
Males Multi-lang
Matte black head and upper chest, metallic green back, bright yellow belly, and a conspicuous, thick bare eye-ring of pale sky-blue color.
Females Multi-lang
Head, chest, and back are dark slate-gray to brownish. Yellow belly. The blue eye-ring is very thin and fragmented, or completely absent.
Evolutionary Adaptations Multi-lang
Heterodactyl Feet: All trogons possess a toe configuration unique in the avian world called heterodactyly (digits 3 and 4 point forward, while 1 and 2 point backward). This special anatomy allows them to grip horizontal branches firmly, enabling them to maintain their characteristic upright and motionless posture for long hours with minimal energy expenditure.
Hover-gleaning: Although they spend much time still, their feeding method is highly active. Upon locating a fruit or insect on the tip of a branch too thin to support their weight, the trogon flies towards it and hovers in the air (fluttering rapidly) for a brief second to snatch its prize with its bill without ever landing.
Main Threats Multi-lang
Loss of Nesting Sites: Because they depend strictly on large arboreal termite nests to reproduce, the felling of mature trees or the cleaning of termitaria on cattle ranches and agricultural farms directly eliminates their ability to nest.
Forest Fires: Usually confined to deciduous dry forest ecosystems, forest fires (often deliberately set to renew cattle pastures) during the dry season can devastate their habitat and nests.
Interesting Facts Multi-lang
Nesting with the Enemy: To protect their young, Black-headed Trogon pairs excavate their nest directly inside large black arboreal termite mounds, or even in massive active paper wasp nests. Surprisingly, the host insects usually tolerate the birds or seal off the trogon's nest chamber, providing them with a nearly impenetrable fortress against predators like monkeys or snakes.
Sedentary Ninjas: Despite their brilliant colors (neon yellow and metallic green), they are very difficult to spot. This is due to their survival strategy: they perch under the shaded canopy with their backs to observers (showing their dark green/grey back) and remain absolutely motionless for long periods, becoming invisible among the leaves.