<trp-post-container data-trp-post-id='360508'>Southern Yellowthroat

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Southern Yellowthroat

En bref

  • Scientific Name: Geothlypis velata
  • Spanish Name: Reinita gorjeadora sureña
  • Family: Parulidae
  • Known Nicknames: Southern Yellowthroat, Masked Yellowthroat
  • Average Length: 12–14 cm / 4.7–5.5 in
  • Average Weight: 10–14 g / 0.35–0.49 oz
  • Wingspan: 16–19 cm / 6.3–7.5 in
  • Key Feature: Black mask extending from bill to ear coverts (males), bordered by white or gray; yellow throat and breast
  • Régime alimentaire principal : Principalement insectivore
  • Range: Eastern Bolivia, southern Brazil, Paraguay, Uruguay, and northern Argentina
  • Habitat: Dense undergrowth near water, marshes, wet grasslands, and riparian thickets
  • Social Structure: Solitary or in pairs during breeding; loosely territorial
  • Nesting/Breeding: Cup-shaped nest built low in dense vegetation, often near ground level
  • Statut de conservation : Préoccupation mineure (LC)
  • Évolution démographique : Stable

The Southern Yellowthroat (*Geothlypis velata*) is a striking warbler of South American wetlands, instantly recognized by the male’s bold black “Zorro” mask that contrasts sharply with a bright yellow throat and upper breast, set against an olive-green back and a grayish belly. Unlike its northern cousins, this species lacks a white border above the mask, giving it a sleeker, more dramatic facial pattern. A special feature is its secretive, skulking behavior—often heard before seen, with a loud, rhythmic *wich-i-ty, wich-i-ty* song that echoes from dense reeds and cattails. Females are more subdued, with a pale yellow throat and a faint grayish eye-ring, making them expert camouflagers in their marshy homes across southeastern Brazil, Uruguay, and northern Argentina.

Faits amusants

Despite its vibrant yellow throat, the Southern Yellowthroat has a peculiar habit of mimicking the calls of other birds, sometimes even imitating predators like hawks to startle rivals or potential threats. It also exhibits a unique "tail-pumping" behavior, rhythmically bobbing its tail up and down while foraging, which is thought to flush out hidden insects. Interestingly, males are known to build multiple "dummy nests" near their actual nest, a decoy strategy to confuse predators and cowbirds looking to lay parasitic eggs. During courtship, males perform an acrobatic "butterfly flight," fluttering high into the air with wings held stiffly before parachuting back down to their perch.

Habitats et répartition

The Southern Yellowthroat inhabits dense, low-lying vegetation near water, such as marshes, reed beds, swamps, and the edges of rivers and lakes. It thrives in humid environments with tall grasses, cattails, and bushy undergrowth, often hiding within thick cover. Its geographical range is centered in southern South America, spanning from southeastern Brazil, through Paraguay and Uruguay, to central and northern Argentina. It is resident throughout this region, not undertaking long migrations, though local movements may occur in response to seasonal flooding or dry conditions.

Comportements & Reproduction

The Southern Yellowthroat is generally solitary or found in pairs during the breeding season, with males defending small, linear territories along dense, moist vegetation. Mating is monogamous for the season, and courtship involves the male performing a distinctive, fluttering flight display while singing a sharp, repetitive song to attract a female. The female alone builds a deep, cup-shaped nest woven from grass and leaves, typically suspended low in thick reeds or shrubs near water. She lays a clutch of 2-3 pale, speckled eggs, which she incubates for about 12-14 days, while the male provides food and guards the territory. Both parents feed the altricial chicks, which fledge after roughly 10-12 days. A unique reproductive strategy is their tendency to double-brood, raising two successful broods in a single season in favorable conditions, with the male often taking over feeding of the first fledglings while the female initiates a second nest.

Alimentation

The Southern Yellowthroat is primarily insectivorous, foraging low in dense, often marshy vegetation for a wide variety of small arthropods. Its diet consists mainly of caterpillars, beetles, grasshoppers, spiders, and flies, which it gleans from leaves, stems, and the ground. An interesting fact is that during the non-breeding season, it will supplement its diet with small seeds and berries, showing a slight shift in feeding strategy when insect prey becomes less abundant. Another notable behavior is its energetic, furtive hopping through thick undergrowth, often with its tail cocked, as it methodically searches for hidden prey, sometimes even hovering briefly to pluck insects from foliage.

Couleurs

The male Southern Yellowthroat has a bright yellow throat and chest, a bold black mask across the eyes bordered by a white stripe, and olive-brown upperparts. The female lacks the black mask, showing a plain olive face with a pale yellow throat and buffy underparts. Both sexes have a white belly and no distinctive camouflage adaptations beyond the drab, shadow-breaking olive tones of their upper body.

Distribution Map

Places linked to this species. A sighting is never guaranteed.