Stelgidillas gracilirostris
Silhouette: PhyloPic
In 3 days ~10%
The slender-billed greenbul (Stelgidillas gracilirostris) is a species in the monotypic genus Stelgidillas of the bulbul family of passerine birds. It is found in western and central Africa. Its natural habitats are subtropical or tropical dry forest, subtropical or tropical moist lowland forest, and subtropical or tropical moist montane forest.
The slender-billed greenbul was formally described in 1844 by the English naturalist Hugh Edwin Strickland under the binomial name Andropadus gracilirostris from a specimen collected on the island of Fernando Pó (now Bioko) off the west coast of Africa.
A molecular phylogenetic study of the bulbuls published in 2007 found that Andropadus was non-monophyletic. In the subsequent rearrangement to create monophyletic genera, the slender-billed greenbul was moved to the genus Stelgidillas that had been introduced by Harry C. Oberholser in 1899.
Formerly, some authorities also considered the following species (or subspecies) as species within the genus Stelgidillas: Toro olive greenbul (as Stelgidillas hypochloris) Two subspecies of the slender-billed greenbul are recognized:
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Bwindi Impenetrable National Park | 🇺🇬 Uganda | |
| 2 | Kibale National Park | 🇺🇬 Uganda | |
| 3 | Odzala-Kokoua National Park | 🇨🇬 Republic of the Congo | |
| 4 | Semuliki National Park | 🇺🇬 Uganda | |
| 5 | Taï National Park | 🇨🇮 Ivory Coast | |
| 6 | Nyungwe National Park | 🇷🇼 Rwanda | |
| 7 | Aberdare National Park | 🇰🇪 Kenya | |
| 8 | Queen Elizabeth National Park | 🇺🇬 Uganda | |
| 9 | Masai Mara National Reserve | 🇰🇪 Kenya |
Rare
Under 5% of wildlife watchers report a Slender-billed Greenbul sighting in Nairobi on a given day, based on 29 verified sightings from GBIF citizen-science data. It is the 137th most-seen of the 234 birds we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
July and August
In those months about 10% of wildlife watchers report a Slender-billed Greenbul in Nairobi on a given day, against under 5% in September to June, the lowest months. Those are among Nairobi's driest months, with about 30 mm of rain a month against 150 mm in April.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Slender-billed Greenbul sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 cities where we can rate Slender-billed Greenbul sightings, Nairobi has the highest daily chance: under 5%. Next come Kampala (Uganda, under 5%).
Same family: Pycnonotidae
The closest relatives of the Slender-billed Greenbul that you can see in Nairobi (family Pycnonotidae, Bulbuls) are Common Bulbul (about 80%), Yellow-whiskered Greenbul (about 10%) and Cabanis's Greenbul (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Slender-billed Greenbul is recorded against all the birds logged in Nairobi (29 verified sightings), 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.
