AnimaliaHighest rank in taxonomy. Groups all life into domains: Animalia, Plantae, Fungi, etc.IUCN LCInternational Union for Conservation of Nature — the world authority on species extinction risk, using standardized criteria. — Least Concern — widespread and abundant; not at immediate risk of extinction.In ProgressCurrent stage of this record in the editorial review workflow. Recent Sighting
Gymnopithys leucaspis
Bicolored Antbird
(Sclater, 1855)
Detailed Texts Multi-lang
The Bicolored Antbird (Gymnopithys leucaspis) is a medium-sized passerine with an upright posture and a highly contrasting plumage design. True to its name, its coloration is dramatically split in two: its entire back, wings, tail, and flanks are a warm, rich rufous or reddish-chestnut color, while its throat, chest, and the central part of its belly are a bright, pure white. Its face features a broad dark brown or blackish mask that highlights its most striking feature: an extensive ring of bare, intense sky-blue skin around the eye. It possesses sturdy pinkish or grayish legs, and a dark, strong, and straight bill, perfectly adapted for striking prey.
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Julia Trouin
TaxonomyBiological classification ranks placing this species within the tree of life, from Kingdom down to Genus.
PhylumRank below Kingdom. Groups organisms sharing a fundamental body plan (e.g., Chordata = vertebrates and some invertebrates).Chordata
ClassRank below Phylum. Subdivides by structural traits (e.g., Mammalia, Aves, Reptilia, Insecta).Aves
OrderRank below Class. Groups related families sharing common ancestry (e.g., Carnivora, Primates).Passeriformes
FamilyRank below Order. Groups closely related genera (e.g., Felidae = cats, Canidae = dogs).Thamnophilidae
GenusRank just above Species. The first word in the two-part binomial scientific name.Gymnopithys
Taxonomic AuthorityThe scientist who first formally described and published this species, followed by the year of publication.(Sclater, 1855)
Record Completeness
95%Coming soon
Ecology & StatusHow this species lives: habitat preferences, diet, behavior, population status, and role in its ecosystem.
OriginWhether the species is native (evolved here), endemic (found only here), or introduced by human activity.
Native
Population TrendDirection of change in population size over time: increasing, stable, decreasing, or unknown.
Decreasing
Breeding SeasonTime of year when this species typically reproduces or flowers.
Wet Season
Trophic RolePosition in the food chain: producer, herbivore, carnivore, omnivore, decomposer, or parasite.
Insectivore
Recent SightingsWhether this species has been observed in the wild in Costa Rica within recent years.
Yes
Habitat SummaryOverview of the specific ecosystems and environments where this species is found in Costa Rica. Multi-lang
It is a resident strictly tied to the dark understory of primary humid tropical forests and advanced mature forests. It is highly intolerant of deforestation and direct sunlight, avoiding open edges, scrublands, and plantations. In Costa Rica and Central America, it is found primarily in the humid Caribbean lowlands and the South Pacific (such as the Osa Peninsula), from sea level up to about 1,000 meters in elevation.BehaviourDaily activity patterns, movement, territory use, foraging style, and seasonal behavioral changes. Multi-lang
It is a highly nervous and active bird whose daily cycle is tied to the location of the ants. When not with a swarm, they wander erratically searching for the colony's chemical trail. Upon finding the hunting front of the army ants, they cling vertically to low trunks (1 to 2 meters off the ground). They are very noisy; they emit loud alarm calls and harsh scolding ('churrrrr!') and a series of strident descending whistles to announce the discovery of the swarm to the rest of the forest.Social ActivitySocial structure: whether the species is solitary, paired, or colonial; hierarchy and communication. Multi-lang
They live strongly paired, but their social system around the ant swarm is complex. They temporarily tolerate other individuals of their species forming noisy groups above the horde, but they maintain a strict and aggressive dominance hierarchy to occupy the most productive positions for hunting.Feeding GuildWhat the species eats, how it forages or hunts, and its role as a consumer in the food web. Multi-lang
Insectivore / Obligate ant-follower (Sally-pounce).Trophic Chain DetailsSpecific interactions in local food webs: prey species, predators, competitors, and scavengers. Multi-lang
Strict carnivore (Ant-following insectivore). It does not consume ants; its diet consists of ground invertebrates flushed out by the swarm, primarily spiders, wood roaches, large grasshoppers, scorpions, and even small frogs or snakes. Due to their focus on the ground and intense vocalization, they can be ambushed by terrestrial snakes (like the fer-de-lance) or specialized forest hawks.Reproductive BehaviourMating strategies, courtship displays, nesting or spawning behavior, and parental care. Multi-lang
Monogamous birds. Unlike other birds, they do not build an elaborate nest from scratch. They hide their nest close to the ground (less than 1 meter high), using the hollow of a rotting stump, the base of a fallen dead palm frond, or a deep crevice in the bark. They precariously line it with a few dead leaves. The female lays 2 heavily spotted eggs. Both parents share the incubation (which lasts about 15 to 16 days) and the feeding of the chicks, returning stealthily from the ant swarm with whole prey for the young. The young leave the nest at 14 days.Physical Measures
Length (cm)
13.0 - 15.0 cm
Weight (Grams)
28 g - 34 g
Offspring per cycleTypical number of young (live births, eggs, or seeds) produced by one adult in a single reproductive event or breeding season.2 - 2
Sexual DimorphismObservable physical differences between males and females of the same species (e.g., size, coloration, features).No
Lifespan
Sexual MaturityAge at which the individual becomes capable of reproducing for the first time.
12 - 24 Months
Gestation / IncubationDuration from fertilization to birth (mammals) or to hatching (egg-laying species).
15 - 16
Lifespan EstimatedExpected duration of life from birth to natural death under wild conditions.
Males4 - 8 Years
Females4 - 8 Years
Evolutionary AdaptationsInherited traits and behaviors that improve the species' survival and reproduction in its specific environment. Multi-lang
Obligate Ant-following: It is evolutionarily and behaviorally dependent on army ants (Eciton burchellii). Instead of foraging for itself, its brain is wired to locate the nomadic swarms and perch just above them, waiting patiently to hunt the insects fleeing in panic from the horde.
Vertical Perching Anatomy: Its gray legs are exceptionally strong, with long toes and claws specifically designed to cling laterally to thin saplings and vertical trunks in the smooth understory, allowing it to peer down at the swarm without touching the ant-infested ground.
Main ThreatsDocumented pressures reducing the population: habitat loss, hunting, disease, climate change, and invasive species. Multi-lang
Forest Fragmentation: Its greatest threat. Army ant colonies require vast expanses of primary forest to survive. When the forest is fragmented into small patches, the ants die or leave, and the bicolored antbirds, which are unable to forage on their own, starve almost immediately.
Climate Change (Understory Drying): They depend on a very humid and dark microclimate. Rising temperatures and decreased rainfall dry out the leaf litter on the ground, eliminating the insects they feed on and interrupting the ants' cycle.
Interesting FactsSurprising or notable facts that highlight what makes this species unique or ecologically important. Multi-lang
The Swarm Bully: In the world of ant-followers, there is a strict hierarchy based on size and aggressiveness. The bicolored antbird is famous for being a 'bully'; it ruthlessly intimidates, chases, and evicts smaller species (like the Spotted Antbird) to monopolize the best perches right above the swarm front.
Mood Ring Eyes: The bare blue skin patch around its eye functions as an emotional indicator. When the bird is excited, aggressive, or competing for a spot above the swarm, blood flow causes the blue color to intensify or change tone, sending a visual warning signal to other birds.