- Yellow-faced Grassquit
Taxobox
name = Yellow-faced Grassquit
status = LC
status_system = iucn3.1
regnum =Animalia
phylum =Chordata
classis =Aves
subclassis =Neornithes
infraclassis =Neognathae
superordo =Neoaves
ordo =Passeriformes
subordo =Passeri
infraordo =Passerida
superfamilia =Passeroidea
familia =Thraupidae
genus = "Tiaris "
species = "T. olivaceus"
binomial = "Tiaris olivaceus"
binomial_authority = (Linnaeus, 1766)
synonyms ="Tiaris olivacea" (Linnaeus, 1766)The Yellow-faced Grassquit ("Tiaris olivaceus" [See BLI (2004) regarding the species name.] ) is a
passerine bird which breeds from centralMexico toColombia and northwesternVenezuela , and also on theGreater Antilles . It is a vagrant to theUnited States and has been introduced toHawaiʻi . It was formerly alled with theAmerican sparrow s and placed in theEmberizidae .It is a small bird with a conical bill, sharper than that of the related
seedeater s. It is 3.9-4.2 in (10-10.7 cm) long and weighs about 0.345 oz (9.5-10 g). The adult male has an olive-green back, and its face and breast are black apart from a bright yellow throat, supercilia, and lower eyelid spot. The rest of the underparts are greyish olive.The adult female is dull olive-green above and paler grey below, and may have some dark breast smudges. The face pattern is much weaker and duller, and may be almost invisible. Young birds are like the adult female but duller and greyer. Young males begin to acquire full adult plumage in their first year.
The Yellow-faced Grassquit has a weak buzzing trilled "ttttt-tee" call.
It is a common to abundant resident in lowlands and foothills up to 7,500 ft (2,300 m) altitude in semi-open areas such as roadsides, pasture, weedy fields, low scrub and gardens. It sometimes forms loose flocks with other tanagers and emberizids which share its lifestyle. This species feeds mainly on grass seeds, but also takes other seeds, berries and some
insect s.During courtship, the male vibrates his wings as he sings his subdued song, sitting only 1-2 in (a few cm) away so she can properly hear him. The globular nest, built by the female, is made of grass and weed stems and lined with finer material. It has a side entrance and is placed usually less than 1 ft (30 cm) above the ground, often on a grassy bank. This species sometimes forms loose colonies. The clutch is two or three brown-speckled white eggs, which are incubated by the female alone for 12-14 days to hatching.
This bird is not rare and widely distributed; it is thus classified a Species of
Least Concern by theIUCN [BLI (2004)] . It seems to benefit fromdeforestation , increasing in numbers and expanding its range; for example, it is only since 1997 known from the eastern Andean slope ofMeta Department inColombia [Salaman "et al." (2002)] .Footnotes
References
*|year=2004|id=54025|title=Tiaris olivaceus|downloaded=27 July 2007
* (2003): "Birds of Venezuela". Christopher Helm, London. ISBN 0-7136-6418-5
* (1989): "A guide to the birds of Costa Rica". Comistock, Ithaca. ISBN 0-8014-9600-4
* (2002): New and noteworthy bird records from the east slope of the Andes of Colombia. "Caldasia" 24(1): 157-189. [http://www.unal.edu.co/icn/publicaciones/caldasia/24(1)/240111.pdf PDF fulltext]
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