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
Nyctibius griseus
Common Potoo
(Gmelin, 1789)
Detailed Texts Multi-lang
The Common Potoo (Nyctibius griseus) is a medium-sized nocturnal bird with a truly alien appearance and an unsurpassed mastery of camouflage. Its plumage is an intricate cryptic pattern of streaks and mottling in grey, brown, black, and white, designed to perfectly mimic the bark of a dead tree covered in lichens. It possesses a large head with enormous bright yellow or orange eyes, which it keeps closed to fine slits during the day. Its bill is tiny and weak, but conceals a gigantic, wide mouth that opens like a cavern. Its legs are very short, designed solely for clinging to branches, not for walking.
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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).Nyctibiiformes
FamilyRank below Order. Groups closely related genera (e.g., Felidae = cats, Canidae = dogs).Nyctibiidae
GenusRank just above Species. The first word in the two-part binomial scientific name.Nyctibius
Taxonomic AuthorityThe scientist who first formally described and published this species, followed by the year of publication.(Gmelin, 1789)
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.
Stable
Breeding SeasonTime of year when this species typically reproduces or flowers.
Dry 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 avoids dense, dark continuous forests, preferring semi-open environments. It inhabits forest edges, gallery forests, wooded savannas, clearings, plantations, and agricultural areas with remnant trees. It requires dead branches and bare stumps (snags) to roost and hunt. In Costa Rica, it is a widely distributed but hard-to-see bird, present on both the Pacific and Caribbean slopes, from sea level up to about 1,200 meters in elevation.BehaviourDaily activity patterns, movement, territory use, foraging style, and seasonal behavioral changes. Multi-lang
It is a strictly nocturnal and crepuscular bird. It spends the entire day completely motionless, paralyzed in its cryptic posture on a branch, trusting blindly in its camouflage (even if approached within inches). At dusk, it wakes up and adopts a more horizontal, owl-like posture. It uses a sallying hunting technique: it detects a flying insect, makes a short, silent, acrobatic flight from its perch to catch it, and returns to the exact same stump to wait again.Social ActivitySocial structure: whether the species is solitary, paired, or colonial; hierarchy and communication. Multi-lang
It is a strictly solitary bird, very rarely seen in pairs, except during the mating season or when there is a chick in the nest. They disperse over large territories to avoid competition.Feeding GuildWhat the species eats, how it forages or hunts, and its role as a consumer in the food web. Multi-lang
Nocturnal aerial insectivore (Sally hunter).Trophic Chain DetailsSpecific interactions in local food webs: prey species, predators, competitors, and scavengers. Multi-lang
Carnivore (Nocturnal aerial insectivore). Its diet consists almost exclusively of large flying insects: rhinoceros beetles, giant moths, true bugs, cicadas, and dung beetles. Adults have few predators due to their perfect camouflage, but white-faced capuchin monkeys, toucans, and forest hawks may devour the single egg or the chick if they manage to detect it.Reproductive BehaviourMating strategies, courtship displays, nesting or spawning behavior, and parental care. Multi-lang
They are seasonally monogamous, but they build no nest whatsoever. The female lays a single whitish egg with lilac spots directly on a small natural depression, crevice, or the broken end of a bare stump, balancing it precariously. Both the male (during the day) and the female (during the night) take turns incubating it by sitting on it in their stump posture for about 33 days. The chick is altricial but hatches covered in white down and quickly learns to adopt the broken branch posture of its parents to camouflage itself.Physical Measures
Length (cm)
33.0 - 38.0 cm
Weight (Grams)
145 g - 190 g
Offspring per cycleTypical number of young (live births, eggs, or seeds) produced by one adult in a single reproductive event or breeding season.1 - 1
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).
33
Lifespan EstimatedExpected duration of life from birth to natural death under wild conditions.
Males10 - 15 Years
Females10 - 15 Years
Evolutionary AdaptationsInherited traits and behaviors that improve the species' survival and reproduction in its specific environment. Multi-lang
Stump Camouflage (Cryptic Posture): During the day, it perches at the end of a dead branch or broken stump. It stretches its body upwards, points its bill towards the sky, and freezes. In this posture, its feathers blend perfectly with the wood, making it look exactly like an extension of the broken trunk.
Magic Eye Slits: To avoid ruining its camouflage, it keeps its enormous yellow eyes closed during the day. However, it has small, special notches or slits in the folds of its upper eyelids that allow it to watch its surroundings and detect predators even with its eyes completely closed.
Main ThreatsDocumented pressures reducing the population: habitat loss, hunting, disease, climate change, and invasive species. Multi-lang
Superstition and Persecution (Myths): Its unusual appearance, reflective eyes at night, and chilling call mean that in many rural areas it is considered a bird of bad omen, a witch, or a demon, and is frequently stoned or killed out of pure fear.
Loss of Roosting Trees (Selective Deforestation): Although it tolerates open areas, it absolutely requires trees with thick dead branches and natural stumps to camouflage and nest. The removal or cleaning of these dry trees eliminates its vital habitat.
Interesting FactsSurprising or notable facts that highlight what makes this species unique or ecologically important. Multi-lang
The Potoo's Wail: Its call is one of the most famous sounds of the Neotropical night. It is a melancholy, descending whistle ('POO-TOO... po... to... to...') that trails off sadly. A Guaraní legend says it is the grieving soul of a young girl crying for her lost love to the moon.
Net Mouth: Although its outer bill is tiny (the size of a hummingbird's), its mouth is immensely wide and deep. It functions like a giant butterfly net that it opens in mid-flight at night to swallow giant beetles and moths whole.