Horizocerus hartlaubi
Silhouette: Charles J. Sharp and T. Michael Keesey · PhyloPic
In 3 days ~60% in a week ~80%
The western dwarf hornbill (Horizocerus hartlaubi) is a species of hornbill in the family Bucerotidae. It is widely spread across the African tropical rainforest. It was formerly considered to be conspecific with the eastern dwarf hornbill (Horizocerus granti) with the English name
"black dwarf hornbill". The western dwarf hornbill was formally described in 1861 by the English ornithologist John Gould based on a specimen from "Western Africa". Gould coined the binomial name Toccus hartlaubi. The specific epithet was chosen to honour of the German ornithologist Gustav Hartlaub. This species was previously assigned to the genus Tockus but is now placed in the genus Horizocerus that was introduced in 1899 by the American ornithologist Harry C. Oberholser.
The western dwarf hornbill was formerly considered to be conspecific with the eastern dwarf hornbill (Horizocerus granti) with the English name "black dwarf hornbill". It is black with a curved beak and a wide white brow above its eye. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Odzala-Kokoua National Park | 🇨🇬 Republic of the Congo | |
| 2 | Semuliki National Park | 🇺🇬 Uganda |
Possible
About 20% of wildlife watchers report a Black Dwarf Hornbill sighting in Odzala-Kokoua National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 32nd most-seen of the 72 birds we can rate there. Over three days the chance rises to about 60%, and over a week to about 80%, if each day is a fresh chance.
October
In that month about 40% of wildlife watchers report a Black Dwarf Hornbill in Odzala-Kokoua National Park on a given day, against under 5% in May, July and December–February, the lowest months. That is one of Odzala-Kokoua National Park's wettest months, with about 240 mm of rain against 50 mm in January.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Black Dwarf Hornbill 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 parks where we can rate Black Dwarf Hornbill sightings, Odzala-Kokoua National Park has the highest daily chance: about 20%. Next come Semuliki National Park (Uganda, under 5%).
Same family: Bucerotidae
The closest relatives of the Black Dwarf Hornbill that you can see in Odzala-Kokoua National Park (family Bucerotidae, Hornbills) are Black-casqued Hornbill (about 30%), Piping Hornbill (about 30%) and White-thighed Hornbill (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Black Dwarf Hornbill is recorded against all the birds logged in Odzala-Kokoua National Park (9 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.
