Lalage sueurii
Silhouette: PhyloPic
In 3 days ~90% in a week >90%
The white-shouldered triller (Lalage sueurii) is a passerine bird belonging to the triller genus Lalage in the cuckoo-shrike family Campephagidae. It is found in Indonesia and East Timor. The white-winged triller (L. tricolor) of Australia and New Guinea was formerly included in this species but is now treated as a separate species.
It is a fairly small bird, 17 centimetres in length. The bill is grey with a black tip and the legs and feet are black. The male is mainly black above and white below. It has a grey rump, white stripe over the eye, white wing-patches and white on the outer tail-feathers. Females have a similar pattern to the males but are brown instead of black above and have fine black barring on the underparts.
The pied triller is similar but is slightly smaller with a broader stripe above the eye and more white in the wing. The male white-winged triller has no white stripe over the eye. The song of the white-shouldered triller is a metallic whistling which is sometimes given in flight. It also utters a rapid series of harsh notes.
It occurs in eastern Java, southern Sulawesi, Bali and on the Lesser Sunda Islands. It inhabits open woodland, savannas and agricultural land in dry, lowland areas. It feeds on insects, often swooping down from a perch to catch them on the ground. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bali Barat National Park | 🇮🇩 Indonesia | |
| 2 | Komodo National Park | 🇮🇩 Indonesia | |
| 3 | Tangkoko Nature Reserve | 🇮🇩 Indonesia |
Likely
About 60% of wildlife watchers report a White-shouldered Triller sighting in Bali Barat National Park on a given day, based on 690 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 173 birds we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
April, July–August and December
In those months about 70% of wildlife watchers report a White-shouldered Triller in Bali Barat National Park on a given day, against about 50% in January, May–June, September and November, the lowest months.
Between 1 and 4 am
Across all the parks we cover, that three-hour window holds the most White-shouldered Triller sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Yes
Of the 3 parks where we can rate White-shouldered Triller sightings, Bali Barat National Park has the highest daily chance: about 60%. Next come Komodo National Park (Indonesia, about 10%) and Tangkoko Nature Reserve (Indonesia, under 5%).
GBIF citizen-science records
It is estimated from how often the White-shouldered Triller is recorded against all the birds logged in Bali Barat National Park (690 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
