Sunbittern

Language English

Onglets

Description

Distinguishing features

The sunbittern is a medium-sized, primarily terrestrial bird with long legs, a straight bill, and a slender neck. Two white lines above and below its bright red eyes form a distinctive black mask.

Its plumage, streaked in shades of brown, black, and gray, provides excellent camouflage in tropical undergrowth.

When the bird spreads its wings, it reveals striking orange patches bordered in black, forming ocelli—eye-shaped patterns—that stand out against the lighter areas of its plumage.

Reproduction

Because this species has a very wide range that crosses the equator, its breeding season varies from region to region depending on resource availability.

At the appropriate time, both parents build a nest of natural fibers and mud. It is placed on a branch between 2 and 6 metres high, usually near a body of water.

The female typically lays two eggs. Incubation, shared by both parents, lasts less than 30 days. The chicks are nidicolous, remaining in the nest to grow and being fed by regurgitation.

The young leave the nest at about 24 days of age and become indistinguishable from adults by the time they are 2 months old.

Diet

The sunbittern is an ambush hunter, moving slowly before seizing its prey on the ground or in shallow water. Its diet includes a variety of invertebrates such as insects, spiders, snails, crustaceans, and earthworms. It also feeds on small fish, tadpoles, frogs, toads, and lizards.

This bird often “washes” its prey before swallowing, likely to make swallowing easier.

Predators

Among the main predators of the sunbittern are raptors, tree-dwelling snakes, and certain carnivorous mammals. The eggs and young are particularly vulnerable.

Habitat

This species is found in Central and South America, in lowland tropical forests, usually near a stream, a slow-moving river, a swamp, or a flooded area. The sunbittern prefers shaded, quiet environments with dense ground vegetation.

Its range extends from Mexico to Brazil. The global population is estimated at 500,000 individuals.

Ecology, behaviour

Elusive by nature, the sunbittern is most active at dawn and dusk. It moves slowly on the ground, pausing frequently to scan its surroundings. As an opportunistic predator, it helps regulate populations of invertebrates and small vertebrates in tropical ecosystems.

Territorial and solitary, it displays a spectacular feature of its plumage when spreading its wings.

The circular orange and black markings on its wings serve as important communication signals. When threatened, the bird suddenly opens its wings to intimidate a predator, simulating eyes or the presence of a larger animal. This visual defense is particularly effective against terrestrial or aerial predators.

Although less well documented, these wing patterns may also be used along with specific vocalizations during courtship displays. The sunbittern also uses its wings to signal to other individuals, whether as an alarm or to assert territorial dominance.

Outside of these contexts, it keeps its wings folded, blending into the vegetation thanks to its cryptic plumage. This alternation between passive camouflage and active visual signaling reflects a behavioural strategy finely tuned to life on the forest floor.

French name

Caurale soleil

Scientific name

Eurypyga helias

Phylum

Chordata

Class

Birds

Order

Eurypygiformes

Family

Eurypygidae

Size

Length: 43 to 48 cm

Weight

Average: 188.5 g

Life span

In captivity, 30 years

Status

Least concern (UICN)

At the Biodôme

You can observe its slow movements along the capybara beach in the Tropical Rainforest ecosystem. It is often heard whistling, especially at dawn and dusk. Confident by nature, it does not hesitate to confront other residents of the beach—capybaras, turtles, and ducks—where it takes its sunbaths.

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