<trp-post-container data-trp-post-id='265365'>Northen Screamer
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En bref
- Scientific Name: Chauna chavaria
- Nom espagnol : Chajá
- Famille : Anhimidae
- Known Nicknames: Crested Screamer, Chavaria
- Average Length: 86–94 cm / 34–37 in
- Average Weight: 3.8–4.5 kg / 8.4–9.9 lb
- Wingspan: 150–170 cm / 59–67 in
- Key Feature: Long, erectile crest on the head and prominent spurs on the wings
- Régime alimentaire principal : Principalement herbivore (plantes aquatiques, feuilles, graines)
- Range: Northern Colombia and northwestern Venezuela
- Habitat: Freshwater wetlands, marshes, and lakeshores
- Social Structure: Highly Social (often found in pairs or small flocks)
- Nesting/Breeding: Large platform nest built in reeds or on floating vegetation
- Statut de conservation : Quasi menacé (NT)
- Évolution démographique : En baisse
The Northern Screamer (*Chauna chavaria*) is a large, prehistoric-looking waterbird native to the wetlands of northern Colombia and northwestern Venezuela, instantly recognizable by its stout, chicken-like body, long legs, and a distinctive, erectile crest of feathers on its head. Its most unique characteristic is the pair of sharp, bony spurs on each wing—up to an inch long—used in fierce territorial battles against rivals and predators. Clad in mostly slate-gray plumage with a lighter belly and a conspicuous white ring around its neck, this bird is far more vocal than its secretive appearance suggests. True to its name, it produces a loud, far-carrying, two-toned scream that echoes across marshes, often performed in duets by mated pairs to defend their territory. Unlike ducks or geese, the Northern Screamer has a weak, labored flight but compensates with exceptional swimming and wading abilities, using its long toes to navigate floating vegetation. Its most special feature, however, is a network of air sacs beneath its skin that makes it surprisingly buoyant and gives its flesh a distinctive, crackling sound when handled—a bizarre adaptation that sets it apart from nearly all other birds.
Faits amusants
Despite its name, the Northern Screamer is a surprisingly clumsy flier, often crash-landing into trees or water with a loud thud, but it compensates with powerful legs and webbed feet that make it an excellent swimmer and runner. Its most bizarre adaptation is a pair of sharp, bony spurs on the leading edge of each wing, which it uses as weapons in vicious mid-air battles with rivals, sometimes even breaking the spur off inside an opponent. They are also notorious for their piercing, far-carrying alarm call—a two-syllable shriek that sounds like a panicked goose mixed with a horse whinny, audible from over a mile away. Oddly, they are one of the few bird species that will actively chase and attack large predators like capybaras or caimans if they get too close to their nest, using their wings as clubs.
Habitats et répartition
The Northern Screamer inhabits lowland freshwater wetlands, primarily found in sluggish rivers, oxbow lakes, swampy marshes, and flooded grasslands. It prefers areas with dense emergent vegetation like rushes and reeds, which provide cover for nesting and roosting, and is often seen in pairs or small flocks grazing on aquatic plants. Its geographical range is restricted to northern South America, occurring along the Caribbean coast of Colombia from the Sinú River valley eastward into the Lake Maracaibo basin of northwestern Venezuela.
Comportements & Reproduction
Northern screamers are monogamous and form strong, long-term pair bonds. Their social structure is primarily based on these mated pairs, which defend a territory around their nest site from other screamers, though they may forage in loose, non-aggressive groups outside the breeding season. Mating involves elaborate synchronized displays, including head-bobbing, mutual preening, and loud duet calling to reinforce the pair bond. A unique reproductive strategy is their use of large, floating platform nests built from reeds and aquatic vegetation, often anchored in shallow water. Both parents share incubation duties for about a month, and the precocial chicks are able to swim and feed themselves almost immediately after hatching, though they remain under close parental guard for several months.
Alimentation
The Northern Screamer (Chauna chavaria) is primarily herbivorous, with its diet consisting almost entirely of aquatic and semi-aquatic vegetation such as grasses, sedges, water hyacinths, and the leaves and stems of plants found in marshes and wetlands. They are known to graze in shallow water, using their strong, hooked bills to tear and uproot plant matter, and they occasionally supplement their diet with small amounts of insects, snails, or other invertebrates, particularly during breeding season. Interestingly, despite their large size and goose-like appearance, they lack a muscular gizzard and instead rely on a specialized, heavily keratinized lining in their stomach to grind tough plant fibers, a trait unique among waterfowl. Additionally, they have been observed ingesting small pebbles and grit to aid in mechanical digestion, and their feeding habits play a crucial role in controlling the overgrowth of aquatic plants, helping to maintain the ecological balance of their wetland habitats.
Couleurs
The Northern Screamer has a mostly dark gray to black body with a white or pale gray belly and a prominent white patch on the wing coverts, visible in flight. Its head is gray with a distinct white ring around the eye and a long, backward-curving black crest. Unique features include a thick, reddish-orange bill and bare, red skin on the face and throat, with two sharp, forward-pointing spurs on each wing used for defense. It lacks camouflage adaptations, instead relying on its loud, far-carrying calls and open wetland habitat for visibility.
Distribution Map
Places linked to this species. A sighting is never guaranteed.
