
Family Turdidae
Pale-vented Thrush
Turdus obsoletus
In Spanish: Mirlo Vientriblanco (Yigüirro de Montaña)
- Resident
A shy, white-vented thrush of Caribbean slope forest edges.
The Pale-vented Thrush (Mirlo Vientriblanco) is easy to overlook, because the Clay-colored Thrush is far more numerous and looks similar. This one is shy, mostly stays in the trees and can be quite uncommon.
In Costa Rica the nominate form lives on the Caribbean slope, in foothill and lower middle elevation rainforest. Its giveaway is a clean white vent against plain reddish brown plumage.
On a trip we build around Arenal and La Fortuna, a fruiting tree is the place to look. A couple of Pale-vented Thrushes have been picked out there among many Clay-colored ones feeding in fruiting figs.
How to find it
Check fruiting trees first. Pale-vented Thrushes were seen among Clay-colored Thrushes in fruiting figs at Arenal, and taking berries at Virgen del Socorro. Fruiting trees near Poas drew them too, and a Lovely Cotinga might visit such trees as well. Scan forest edges and clearings rather than the canopy, and go through any group of Clay-colored Thrushes slowly, because a couple of Pale-vented birds can hide among many. A short walk before breakfast along the wooded entrance road to Tapantí has also turned them up. One Costa Rica birder usually found it just after entering the trail at a local patch, but in a dry spell with few fruiting trees it was missing.
How to recognise it
Look for a dark rufous-brown bird above and paler below.
The clearest mark is the white vent: the belly and undertail coverts are white and stand out against the duller underparts.
The chin and throat are whitish with dark streaks, fine and gray against plumage that is otherwise plain reddish brown.
The bill is black and the eye is dark.
Males and females look alike, so there is no need to sort the sexes.
Beside a Clay-colored Thrush, check for the paler underparts and that white vent.
Behaviour and diet
This is a shy bird that mostly stays in trees. It eats both insects and fruit, and although it is mostly tree-dwelling it will come to the ground to feed. It may form small groups or join mixed-species feeding flocks.
In Costa Rica it has been seen feeding among Clay-colored Thrushes in fruiting figs at Arenal. Near Poas, fruiting trees drew Pale-vented and Mountain Thrushes foraging together. At Virgen del Socorro, berry-eating birds included Pale-vented Thrushes, tityras and elaenias.
Where it lives
It uses the middle and lower levels of humid forest, but not the canopy. It is most often seen at forest edges and clearings, and it is found in forest borders in the foothills.
Its range is roughly 500 to 1900 m. In Costa Rica the nominate form lives on the Caribbean slope, where one tour report calls it a rather uncommon thrush of middle elevations. Some birds have also been seen in scrubby areas on that slope. Its range continues south into Panama and northwest Colombia.
When to see it
One old account says the species is mostly at middle elevations but moves lower in the wet season, with Costa Rica given as an example.
Similar birds
The Clay-colored Thrush is far more numerous and looks similar, but the Pale-vented has paler underparts and a clearly white vent. The White-throated Thrush has distinctive white streaking on the throat. The Mountain Thrush is darker overall and keeps to higher elevations.
Names and lore in Costa Rica
Costa Ricans call it Mirlo Vientriblanco. A second name is Yigüirro de Montaña, shared with the White-throated Thrush. The plain Yigüirro is the Clay-colored Thrush, the national bird.
Status and conservation
The official Costa Rican bird list gives it the status R, meaning resident, and the IUCN lists the species as Least Concern.
Photography tips
Fruiting trees are the best bet for a clear view, since the bird is shy and otherwise stays in the trees. Be ready for brief views: at Braulio Carrillo one was seen only as it flew off.
How we know this 20 sources, each read on the date shown
- Cornell Birds of the World read 2026-11-04
https://birdsoftheworld.org/bow/species/pavthr1/cur/introduction - STRI Research Portal (Panama) read 2026-11-04
https://panamabiota.org/stri/taxa/index.php?taxauthid=1&taxon=3810&clid=8 - Lista Oficial de las Aves de Costa Rica (AOCR) read 2026-11-04
https://listaoficialavesdecostarica.wordpress.com/lista-oficial/lista-oficial-online/ - Avibase read 2026-11-04
https://avibase.bsc-eoc.org/species.jsp?avibaseid=E124336D71569CAB - Field Guides Birding Tours read 2026-11-04
https://fieldguides.com/triplists/cr215.html - Birding Craft read 2026-11-04
https://birdingcraft.com/wordpress/category/birds-to-watch-for-in-costa-rica/ - Birding Craft read 2026-11-04
https://birdingcraft.com/wordpress/tag/costa-rica-birds/ - John Gordon, Listening to Birds read 2026-11-04
https://thecanadianwarbler.blogspot.com/2025/03/costa-rica.html - Birding Craft read 2026-11-04
https://birdingcraft.com/wordpress/2022/07/27/birding-trip-to-costa-rica-5-honest-expectations/ - Copa de Arbol read 2026-11-04
https://www.copadearbol.com/costa-rica-national-bird-clay-colored-thrush-birdwatching/ - Field Guides tour report, Costa Rica 2018 read 2026-11-04
https://fieldguides.com/triplists/cos18.html - Exotic Birding, Braulio Carrillo checklist read 2026-11-04
http://www.exoticbirding.com/costarica/braulio-carrillo/checklist.html - Birdfinders trip report, Costa Rica 2011 read 2026-11-04
https://birdfinders.co.uk/pdf/costa-rica-2011.pdf - Field Guides tour report, Costa Rica 2015 read 2026-11-04
https://fieldguides.com/triplists/cos15.html - Wikipedia read 2026-11-04
https://en.wikipedia.org/wiki/Pale-vented_thrush - BirdForum Opus read 2026-11-05
https://www.birdforum.net/opus/Pale-vented_Thrush - BirdForum read 2026-11-05
https://www.birdforum.net/threads/birdingcrafts-costa-rica-patch.131932/ - Field Guides Costa Rica 2016 trip list read 2026-11-05
https://fieldguides.com/triplists/cos16.html - Exotic Birding, Tapantí checklist read 2026-11-05
http://www.exoticbirding.com/costarica/tapanti-national-park/checklist.html - Dibird read 2026-11-05
https://dibird.com/species/pale-vented-thrush/