
Family Tyrannidae
Ochre-bellied Flycatcher
Mionectes oleagineus
In Spanish: Mosquerito Aceitunado (Tontillo)
- Resident
Small olive and ochre forest flycatcher that flicks its wings on landing.
The Ochre-bellied Flycatcher (Mosquerito Aceitunado, or Tontillo) is a small, plain bird of shady forest understory. It has no obvious field marks, so it rewards the birder who slows down and looks carefully.
In Costa Rica it is a resident of humid forest on both the Caribbean and Pacific slopes, below about 1200 m. Tour leaders have called it fairly widespread in lowland forest on both slopes.
Birders have met it at bathing pools, beside fruiting plants on quiet trails and along a lodge driveway. A sharp eye for small movements matters more than any field mark.
How to find it
Expect it in shady forest understory at many lower elevations. Watching fruiting plants beside trails is a good way to find it; one bird was eating berries along a path at Wilson Botanical Garden. Watch for the wing flick as it lands, which is a handy clue in the understory. Look along shaded streams too, since the nest often hangs over water. It can pop up at the edge of a driveway, as one did several times at Talari. It is small and inconspicuous, so patience pays.
How to recognise it
This is a small bird, about 13 cm long, and plain by design.
The upperparts, head and upper breast are olive-green. The underparts are ochre, with a dull orange belly. The cheeks and throat are greyish olive. Two buff wing bars cross the wing; they are faint, so look closely. The base of the lower bill is pink to orange, a detail worth checking if you get a good view.
Males and females look alike. Young birds look like adults but have a paler, more yellowish belly. It also helps to remember what it lacks: there is no white on the head, wings or belly.
What it sounds like
Recording: Niels Krabbe, CC BY-SA 4.0, source, read 5 Nov 2026.
Behaviour and diet
It eats fruit and insects. It hover-gleans from a perch in short sallies and forages mostly in the lower and middle forest levels. It usually feeds alone, but sometimes joins mixed flocks at fruiting trees.
Its most useful habit for spotting it is a distinctive flick of one wing and then the other when it lands. Males sing from leks, which are display groups, and finding the lek is much harder than finding the bird itself. Up to six males perch in shaded understory, 15 to 50 m apart.
Where it lives
In Costa Rica it lives in humid forest on both the Caribbean and Pacific slopes, below about 1200 m. Across its wider range it is a common bird of humid forest, usually in the undergrowth near water, and it favours forest edges along streams.
In the Central Valley it was known only from the southwest, near the El Rodeo protected zone. A 2006 record from Heredia, at 1400 m, was the first north of the valley. It sometimes wanders into semi-cleared areas and gardens near Turrialba, but only rarely.
When to see it
Courtship and singing at display groups is reported between March and July, in a general account that cites a Costa Rica bird guide rather than speaking only of Costa Rica.
Similar birds
Costa Rica has a close relative, the Olive-streaked Flycatcher (Mionectes olivaceus), called Mosquerito Ojimanchado. The Ochre-bellied is plain and dull, with no white on head, wings or belly. That helps separate it from other forest flycatchers of similar habitat, such as the Slaty-capped Flycatcher. Two faint ochre wing bars also help.
Names and lore in Costa Rica
In Costa Rica the species is called Mosquerito Aceitunado, and Tontillo is the everyday name. Tontillo is also used for the Olive-streaked Flycatcher, so the name can cover both birds.
Status and conservation
The AOCR list classes it as a resident in Costa Rica, and globally the IUCN rates it Least Concern, with a very large range.
Photography tips
Watch fruiting plants beside trails and the shaded edges of streams, and wait for the wing flick that gives it away. A nesting bird can be very confiding: one female with a nest beside a trail made several visits and sat on a fence for long minutes while a tour group stood close by. The nest is a moss-covered ball with a side entrance, hanging from a root or branch, often over water.
How we know this 20 sources, each read on the date shown
- Brenesia 67 (Sandoval 2007) read 2026-11-04
https://www.researchgate.net/publication/259892707_Nueva_localidad_para_Mionectes_oleagineus_Tyrannidae_Aves_en_Costa_Rica - World Bird Photos read 2026-11-04
https://www.worldbirdphotos.com/photo/flycatcher-ochre-bellied-mionectes-oleagineus-costa-rica/ - Zenodo (Myrsidea oleaginei description) read 2026-11-04
https://zenodo.org/records/6488055 - Cloudbridge Nature Reserve bird list read 2026-11-04
https://www.cloudbridge.org/wp-content/uploads/2020/04/Bird-Species-List-Costa-Rica-13-April-2020.pdf - Birds Colombia (Wikipedia text) read 2026-11-04
https://birdscolombia.com/2021/03/29/atrapamoscas-ocraceo-ochre-bellied-flycatcher-mionectes-oleagineus/ - Wikipedia (Spanish) read 2026-11-04
https://es.wikipedia.org/wiki/Mionectes_oleagineus - Wikipedia read 2026-11-04
https://en.wikipedia.org/wiki/Ochre-bellied_flycatcher - Lista Oficial de las Aves de Costa Rica (AOCR) read 2026-11-04
https://listaoficialavesdecostarica.wordpress.com/lista-oficial/lista-oficial-online/ - Field Guides Birding Tours, Costa Rica trip list read 2026-11-04
http://fieldguides.com/triplists/cos12.html - Field Guides Birding Tours, Costa Rica 2018 read 2026-11-04
https://fieldguides.com/triplists/cos18.html - Field Guides Birding Tours, Costa Rica 2024 read 2026-11-04
https://fieldguides.com/triplists/cos24.html - John Gordon, Listening to Birds blog read 2026-11-04
https://thecanadianwarbler.blogspot.com/2025/03/costa-rica.html - Field Guides Birding Tours, Deep South 2023 read 2026-11-04
https://fieldguides.com/triplists/cr123.html - Birds for Beer (Turrialba) read 2026-11-04
https://birdsforbeer.com/2020/09/29/ochre-bellied-flycatcher/ - Field Guides Birding Tours, Deep South 2018 read 2026-11-04
https://fieldguides.com/triplists/cr118.html - Birda species guide read 2026-11-04
https://app.birda.org/species-guide/17018/Ochre-bellied_Flycatcher - BirdForum Opus read 2026-11-04
https://www.birdforum.net/opus/Ochre-bellied_Flycatcher - Wikipedia read 2026-11-04
https://en.wikipedia.org/wiki/Ocher-bellied_Flycatcher - Birding Craft read 2026-11-04
https://birdingcraft.com/wordpress/tag/olive-sided-flycatcher/ - Animal Diversity Web read 2026-11-04
https://animaldiversity.org/accounts/Mionectes_oleagineus/