| Silvered antbird | |
|---|---|
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| Male | |
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| Female | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Thamnophilidae |
| Genus: | Sclateria Oberholser, 1899 |
| Species: | S. naevia |
| Binomial name | |
| Sclateria naevia (Gmelin, JF, 1788) | |
 | |
| Synonyms | |
Sitta naevia | |
Thesilvered antbird (Sclateria naevia) is apasserinebird in subfamily Thamnophilinae of familyThamnophilidae, the "typical antbirds". It is found onTrinidad and in every mainland South American country exceptArgentina,Chile,Paraguay, andUruguay.[2]
The silvered antbird wasformally described in 1788 by the German naturalistJohann Friedrich Gmelin in his revised and expanded edition ofCarl Linnaeus'sSystema Naturae. He placed it with the nuthatches in thegenusSitta and coined thebinomial nameSitta naevia.[3][4] Gmelin based his description of the "wall-creeper of Surinam" that had been described and illustrated in 1764 by the English naturalistGeorge Edwards in hisGleanings of Natural History. Edwards' specimen was preserved in spirits. It had been presented to the physicianJohn Fothergill.[5] The silvered antbird is now the only species placed in the genusSclateria that was introduced in 1899 by the American ornithologistHarry C. Oberholser. The genus name was chosen to honor the ornithologistPhilip Sclater.[6][2] Thespecific epithet is from theLatinnaevius meaning "spotted".[7]
The silvered antbird has these foursubspecies:[2]
The silvered antbird is 14 to 16 cm (5.5 to 6.3 in) long and weighs 21 to 27 g (0.74 to 0.95 oz). Adult males of thenominate subspeciesS. n. naevia have a dark gray crown, nape, and upperparts. Their wings and tail are blackish gray with white tips on the wingcoverts. Their face is mostly dark gray with a paler graysupercilium. Their underparts are mostly white with gray scalloping that is lightest on the throat. Their flanks,crissum, and underwing coverts are gray. Adult females have the same pattern as males but are grayish brown where the male is gray and have cinnamon tips on the wing coverts. Subadult males look like adult females.[8][9][10]
Males of subspeciesS. n. argentata have almost white underparts with faint light gray mottling on the breast and flanks and a paler gray crissum than the nominate. Females have grayer upperparts than the nominate; their underparts vary from white with buffy brown sides and vent area to deep buff with browner sides and vent.S. n. toddi is intermediate between the nominate andargentata.S. n. diaphora males have small white dots, rather than white tips, on their wing coverts, and mostly gray underparts with a few thin white streaks on the breast. Females have ochraceous tawny underparts with little to no mottling.[8][9][10][11][12][13]
The subspecies of the silvered antbird are found thus:[8][9][10][11][12][13]
The silvered antbird inhabits the floor and understorey of tropicalevergreen forest, primarilyvárzea andigapó but also along streams interra firme and in swampy areas within the forest. It favors areas with vine tangles, branches, and vegetation that overhands the water's edge. In Trinidad and Suriname it also occurs in mangrove swamps and in Ecuador and Peru is found inMauritia flexuosa palm swamps. In elevation it reaches 500 m (1,600 ft) in Venezuela and Colombia, 450 m (1,500 ft) in Ecuador, 600 m (2,000 ft) in Peru.[8][9][10][11][12][13]
The silvered antbird is believed to be a year-round resident throughout its range.[8]
The silvered antbird feeds primarily on a variety insects and spiders. It forages as individuals, pairs, and small family groups and mostly within about 1 m (3 ft) of the ground and seldom withmixed-species feeding flocks. They hop along the ground and among low branches, and take prey mostly by picking from leaf litter and by reaching up to leaves and twigs. They also pick prey from the water's surface while perched above it. They rarely attendarmy ant swarms, which are rare in its often-flooded habitat.[8][9][11][12][13]
The silvered antbird's breeding season is not known but appears to vary geographically. It includes August in Suriname and northern Brazil and spans at least October to November in Peru. Its nest is an open cup of thick rootlets and moss with bits of fern and lined with thinner rootlets. It is typically woven to low branches overhanging water. The clutch is usually two eggs that are bluish white with red-brown spots and blotches. The incubation period, time to fledging, and details of parental care are not known.[8]
| Songs and calls |
The silvered antbird's song is "a long rapid trill...of abrupt notes, introduced by more emphatic and higher note than immediately following ones, latter building in intensity and rising in pitch, then dropping off steeply at end".[8] It has been written as "jyíp, ji-ji-ji-ji-ji-jíjíjíjíjí-ji-ji-jrrr"[12] and "tweep, twep, tip-tip-tip-tip-tí-tí-ti-ti-ti=TI-TI-TI-TI-TI-ti-ti-ti-ti-ti-i-i-i"[9]. Its calls include "abrupt 'pit' notes" and a "long downslurred whistle".[8]
TheIUCN has assessed the silvered antbird as being of Least Concern. It has a very large range; its population size is not known and is believed to be stable. No immediate threats have been identified.[1] It is considered fairly common in most of its range and common in Colombia.[8][11] Its range includes many protected areas and "also encompasses extensive areas of suitable habitat which are not formally protected, but appear to be at little risk of development in near future".[8]
