Quebracho Crested Tinamou (Eudromia formosa)

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Image of a Quebracho Crested Tinamou in its natural habitat
Birds Tinamou

Introduction

The Quebracho Crested Tinamou (Eudromia formosa) is a ground-dwelling tinamou of the Gran Chaco in South America. It inhabits dry woodland, thorn scrub and semi-open savanna, where its cryptic plumage and cautious behaviour can make it easier to hear than see. The species belongs to the family Tinamidae and is recognised by the IOC World Bird List and other major modern taxonomic authorities. (ww.worldbirdnames.org)

Physical Description

The Quebracho Crested Tinamou is approximately 38 centimetres long. It has a compact, rounded body, short tail and strong legs suited to walking and running on the ground. The upperparts are reddish or greyish brown, marked with black, buff and pale streaks. The underparts are paler, with a whitish throat, a greyish breast, darker spotting and heavy black barring on the flanks. Its most distinctive feature is the long, narrow crest extending from the crown. The head and neck also show contrasting pale stripes around the eye and along the sides of the face and neck. (sib.gob.ar)

Reliable evidence for consistent differences between adult males and females is limited, and the sexes are not normally separated by obvious plumage characters in the field. Juveniles and chicks are more extensively streaked and mottled than adults. Downy chicks have a conspicuous pale stripe along the centre of the back, which combines with the pale head markings to break up their outline when they crouch motionless among vegetation. (researchgate.net)

Range and Habitat

The species is associated with the dry Chaco of north-western Argentina, western Paraguay and extreme south-eastern Bolivia. In Argentina, its range includes parts of Salta, Tucumán, Santiago del Estero, Chaco and Formosa provinces. Records from Bolivia are concentrated in the Bolivian Chaco. (sib.gob.ar)

It occupies dry quebracho woodland, thorn forest, algarrobo woodland, savanna and semi-open areas bordering denser xerophytic forest. The species is also recorded in transitional woodland and habitats with a relatively open understorey. It occurs mainly at low elevations, generally below about 500 metres. The Quebracho Crested Tinamou is considered sedentary, although detailed information on local movements remains limited. (sib.gob.ar)

Geographic variation has been described within the species. The Paraguayan population has historically been treated as the subspecies Eudromia formosa mira, but many modern sources have treated the species as monotypic or have not emphasised subspecific differences. (researchgate.net)

Behaviour and Diet

The Quebracho Crested Tinamou is primarily terrestrial and diurnal. It usually walks through woodland, scrub and open patches while searching for food, and may occur alone, in pairs or in small groups. When alarmed, it often relies on camouflage and rapid running rather than immediately taking flight. Chicks crouch and remain still when threatened, a behaviour that makes their streaked plumage especially effective as camouflage. (researchgate.net)

Its diet is omnivorous but mainly plant-based. Recorded foods include seeds, leaves, buds, flowers, fruits and other plant material, supplemented by ants, beetles, spiders and other small invertebrates. It forages chiefly on the ground and may also take grit or small stones while feeding. (researchgate.net)

Vocal activity is most noticeable during the early morning and late afternoon. Calls include contact, alarm and territorial vocalisations, with males producing loud, repeated whistles during the breeding period. Calling can increase after rain, and vocalisations may be exchanged between neighbouring birds or members of a pair. (researchgate.net)

As in other tinamous, the male performs the main incubation and chick-rearing duties. Available observations indicate that females may lay several eggs in a nest that is subsequently incubated by the male. Sources from Argentina report clutches of up to 11 glossy yellowish eggs, while published field observations from Paraguay indicate that breeding activity may occur over an extended period rather than being restricted to one clearly defined season. (sib.gob.ar)

Identification Tips

Look for a medium-sized, long-crested tinamou in dry Chaco woodland or thorn scrub. The most useful field marks are:

  • A long, narrow crest projecting backwards from the crown.
  • Brown, grey-brown or reddish-brown plumage heavily patterned with black and buff.
  • Pale stripes on the sides of the head and neck.
  • A whitish throat, greyish breast and strongly barred flanks.
  • A preference for walking or running through dense, dry vegetation rather than perching.
  • Loud whistles or contact calls from a bird that may remain hidden in scrub.

The most relevant comparison is the Elegant Crested Tinamou (Eudromia elegans). Both species have a prominent crest and pale facial markings, but the Quebracho Crested Tinamou is generally associated with the Chaco and has warmer reddish-brown tones, a more heavily mottled appearance and habitat preferences centred on dry woodland and thorn scrub. Identification should be made cautiously where the ranges or habitat types approach one another. (researchgate.net)

Conservation Status

The Quebracho Crested Tinamou is currently assessed as Least Concern on the IUCN Red List. The global population has not been quantified, but the species has a broad range and is not considered to be declining rapidly enough to meet the thresholds for a threatened category. The population trend is nevertheless reported as decreasing. (wikipedia.cthon.io)

The principal conservation concerns are the loss and degradation of Chaco dry forest through agricultural expansion, clearance, timber extraction, overgrazing and other land-use changes. Hunting is also recorded as a pressure in parts of the species’ range. Conservation measures include protecting remaining Chaco woodland, maintaining connected areas of native vegetation, improving land-use practices and supporting surveys of this poorly known species. Argentina’s national assessments have regarded the species as threatened at the country level, despite its global IUCN classification of Least Concern. (sib.gob.ar)

Frequently Asked Questions

Where does the Quebracho Crested Tinamou live?

It occurs in the dry Chaco of north-western Argentina, western Paraguay and extreme south-eastern Bolivia. Its habitats include quebracho woodland, thorn scrub, savanna and semi-open areas near dry forest. (faunaparaguay.com)

How large is the Quebracho Crested Tinamou?

It is about 38 centimetres long. It has a compact body, short tail, strong legs and a distinctive elongated crest. (sib.gob.ar)

What does the Quebracho Crested Tinamou eat?

Its diet consists mainly of seeds and other plant material, including leaves, buds, flowers and fruits. It also eats small invertebrates such as ants, beetles and spiders. (researchgate.net)

Can the Quebracho Crested Tinamou fly?

Yes. Like other tinamous, it can fly, but it is primarily a terrestrial bird and commonly escapes danger by running into dense vegetation.

Does the male incubate the eggs?

Yes. The male performs the main incubation and cares for the chicks after hatching, as is typical of tinamous. Available records indicate that the species may lay several glossy yellowish eggs, with clutches of up to 11 reported in Argentina. (sib.gob.ar)

Is the Quebracho Crested Tinamou endangered?

Globally, it is classified as Least Concern by the IUCN. However, its dry Chaco habitat continues to be affected by clearance, agricultural expansion, timber extraction, grazing and hunting, and some national assessments consider it threatened within Argentina. (worldbirdnames.com)

References

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