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White-breasted Thrasher

A species of White-breasted Thrasher
Scientific name : Ramphocinclus brachyurus Genus : White-breasted Thrasher

White-breasted Thrasher, A species of White-breasted Thrasher
Botanical name: Ramphocinclus brachyurus
Genus: White-breasted Thrasher
White-breasted Thrasher (Ramphocinclus brachyurus) Photo By Don Roberson

Description

The white-breasted thrasher is in average 23 to 25 cm long, and weight from 48 to 60 g depending on sex and subspecies. An adult bird has a dark brown plumage with a white throat, breast, and belly. Its dark beak is long and slightly decurved towards the tip. Several dark bristles are located around the lores, between the red eyes and nostrils of the bird. This medium-sized passerine has long and strong black legs and can live up to 7–8 years. Males and females are sexually monomorphic, thus identical in size and coloration. This bird is difficulty sexed by hand or sight due to sexual monomorphism. Males and females have the same plumage and only breeding females can be identified during breading season by their brood patch. The plumage of an immature white-breasted thrasher is uniformly brown, with a brown throat and a greyish belly. The white patch on its breast will develop with age, around a month later. When the bird is in its first year, it can be differentiated to an adult bird by the rusty brown colour of its upper-parts, and its brownish eye color.
Size
23 cm
Life Expectancy
7-8 years
Feeding Habits
White-breasted Thrasher primarily consumes animal proteins and various fruits. It forages for insects and berries, employing a unique hunting technique. Its dietary preferences are adapted to its habitat, with distinctive feeding behaviors and times.
Habitat
White-breasted Thrasher typically resides in deciduous tropical dry forests and shrublands, favoring regions with tall intact canopies, high tree density, and abundant leaf litter. This bird is often found near rivers within ravines, predominantly in coastal and near-coastal areas with elevations ranging from 0-200 meters above sea level. Optimal habitats are in close vicinity to water sources, such as riverbanks, where vegetation is lush and invertebrate prey is plentiful. White-breasted Thrasher avoids areas with low, dense scrub or those too open, and shuns habitats altered significantly by human development or agriculture. The species shows a strong preference for mature forests that maintain humidity and support a diverse food web, including insects and small vertebrates.
Dite type
Insectivorous

General Info

Distribution Area

Because the white-breasted thrasher is endemic to two islands of the Lesser Antilles, its range is dangerously small for species survival. The nominal subspecies, R. b. brachyurus, is only found in Martinique, where its habitat is restricted to a 5 km^2, now protected, area called the Caravelle Peninsula. Whereas R. b. sanctaeluciae inhabits Saint Lucia, which is south of Martinique. Two different populations of this subspecies are distinguished by habitat location on the island: a northern population located in Iyanola municipality and a southern one in Mandelé municipality. Until now, there is no evidence of white-breasted thrasher movement between the two islands.

Species Status

The white-breasted thrasher total population is estimated at 1900 individuals and is ranked as "endangered" according to the IUCN Red List. The rate of decline of the population has largely increased due to habitat loss on both islands. The white-breasted thrasher is able to coexist with some of its predators such as rats and mongooses. However, this predation places an additional burden on the already small thrasher population, especially in Martinique where rats and mongooses are more abundant. That is why organizations charged with environmental protection have started several programs such as: rats extermination and mongoose capture program, and also a program aimed at monitoring the reproduction success of the R. b. brachyurus (in which one of the tasks consists of fixing plastic bottles on nesting trees trunks, preventing predators to reach the nest).
White-breasted Thrasher (Ramphocinclus brachyurus) White-breasted Thrasher (Ramphocinclus brachyurus) Photo By Don Roberson
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