Iole viridescens
Silhouette: PhyloPic
In 3 days ~70% in a week >90%
The olive bulbul (Iole viridescens) is a species of songbird in the bulbul family, Pycnonotidae. It is found from southern Myanmar to south-western Thailand and the Malay Peninsula. Its natural habitats are subtropical or tropical moist lowland forests and subtropical or tropical moist montane forests.
Formerly, the olive bulbul was classified in the genera Microscelis and Hypsipetes by some authorities. The synonym Hypsipetes virescens has also been used for the Nicobar bulbul and the Sunda bulbul. Alternative names for the olive bulbul include Blyth's olive bulbul, Sumatran bulbul, and viridescent bulbul. The name 'olive bulbul' is also used as an alternative name by the yellow-bearded greenbul and the sulphur-bellied bulbul.
Three subspecies are currently recognized. The Cachar bulbul was also considered as a subspecies of the olive bulbul until it was split off and re-classified as a separate species by the IOC in 2017: Iole viridescens viridescens - Blyth, 1867: Found in southern Myanmar and south-western Thailand
Iole viridescens lekhakuni - (Deignan, 1954): Found in southern Myanmar and south-western Thailand Iole viridescens... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Khao Luang National Park | 🇹🇭 Thailand | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Khao Sok National Park | 🇹🇭 Thailand |
Likely
About 40% of wildlife watchers report an Olive Bulbul sighting in Khao Luang National Park on a given day, based on 259 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 37th most-seen of the 215 birds we can rate there. Over three days the chance rises to about 70%, and over a week to over 90%, if each day is a fresh chance.
May
In that month about 60% of wildlife watchers report an Olive Bulbul in Khao Luang National Park on a given day, against about 10% in June, the lowest month.
Between 2 and 5 am
Across all the parks we cover, that three-hour window holds the most Olive Bulbul sightings with a recorded time, and about 6 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 Olive Bulbul sightings, Khao Luang National Park has the highest daily chance: about 40%. Next come Kaeng Krachan National Park (Thailand, about 30%) and Khao Sok National Park (Thailand, about 20%).
GBIF citizen-science records
It is estimated from how often the Olive Bulbul is recorded against all the birds logged in Khao Luang National Park (259 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.
