Horizocerus hartlaubi
Silhouette: Charles J. Sharp and T. Michael Keesey · PhyloPic
In 3 days ~10% in a week ~20%
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 |
Rare
Under 5% of wildlife watchers report a Black Dwarf Hornbill sighting in Semuliki National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 191st most-seen of the 280 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
February, April, July and December
In those months about 10% of wildlife watchers report a Black Dwarf Hornbill in Semuliki National Park on a given day, against under 5% in January, March, May–June and August–November, the lowest months.
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.
2nd of 2
Of the 2 parks where we can rate Black Dwarf Hornbill sightings, Semuliki National Park ranks 2nd at under 5%. The best odds are in Odzala-Kokoua National Park (Republic of the Congo, about 20%).
GBIF citizen-science records
It is estimated from how often the Black Dwarf Hornbill is recorded against all the birds logged in Semuliki National Park (15 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.
