Yellow-faced Grassquit - BirdForum Opus

Male, nominate subspecies
Photo by fishercl
Punta Cana, Dominican Republic, May 2011

Tiaris olivaceus

Identification

Length: 10.0-10.7 cm; weight: 9.5-10.0 g

Conical bill, sharper than that of the related seedeaters

Adult male

Olive-green back
Black face and breast
Bright yellow throat, supercilium, and lower eyelid spot
Greyish-olive underparts

Subspecies pusillus
Photo by COLOMBIA birding
West Andes, Colombia, November 2010

Adult female

Dull olive-green upperparts
Paler grey underparts
Dark breast smudges may be visible
The face pattern is much weaker and duller, and may be almost invisible

Young birds: duller and greyer than the female
Young males: begin to acquire full adult plumage in their first year.

Distribution

Central and South America and the Caribbean
Caribbean (West Indies): Cuba, Cayman Islands, Jamaica, Hispaniola, Haiti, Dominican Republic and Puerto Rico
Central America: Mexico, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica, Panama,
South America: Colombia, Venezuela and Ecuador

Introduced to Hawaii.

Female, Subspecies pusillus
Photo by Stanley Jones
Road to Rincon de la Vieja towards Dos Rios, Guanacaste Province, Costa Rica, November 2011

Taxonomy

Subspecies

There are 5 subspecies^[1]:

T. o. pusillus:

Gulf lowlands of eastern Mexico to Colombia and western Venezuela

T. o. intermedius:

Cozumel Island and Holbox Island (off Yucatan Peninsula)

Male, Subspecies pusillus
Photo by by Stanley Jones
Alajuela Province, Costa Rica, March, 2006

T. o. ravidus:

Isla Coiba (Panama)

T. o. olivaceus:

Cuba, Isle of Pines, Jamaica, Cayman Islands and Hispaniola (Dominican Republic, Haiti)

T. o. bryanti:

Puerto Rico

The scientific name has been spelled olivacea in the past.

Habitat

Rain forest, open grassy areas, woodlands and grassland. Observed at heights around 275 meters.

Behaviour

Diet

They feed mainly on seeds (mostly grass), berries and some insects.

Breeding

The female builds the globular nest, which is formed from stems of grass and weeds. They sometimes nest in loose colonies. The clutch consists of two or three brown-speckled white eggs, which are incubated by the female alone for 12-14 days to hatching.

Vocalisation

Call: a weak buzzing trilled ttttt-tee
The male vibrates his wings as he sings to the female from only a few centimetres away.

References

Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019. The eBird/Clements Checklist of Birds of the World: v2019. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
Raffaele, H, J Wiley, OH Garrido, A Keith, JI Raffaele. 2003. Birds of the West Indies. Princeton: Princeton Univ. Press. ISBN 978-0691113197
Torok, M. and K. J. Burns (2020). Yellow-faced Grassquit (Tiaris olivaceus), version 1.0. In Birds of the World (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.yefgra1.01

List of references

Recommended Citation

BirdForum Opus contributors. (2024) Yellow-faced Grassquit. In: BirdForum, the forum for wild birds and birding. Retrieved 19 April 2024 from https://www.birdforum.net/opus/Yellow-faced_Grassquit

External Links

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