Rhyticeros cassidix
Silhouette: Charles J. Sharp and T. Michael Keesey · PhyloPic
In 3 days >90%
The knobbed hornbill (Rhyticeros cassidix), also known as Sulawesi wrinkled hornbill, is a colourful hornbill native to Indonesia. The species is sometimes placed in the genus Aceros. The knobbed hornbill is the faunal symbol of South Sulawesi province.
The knobbed hornbill is a large black hornbill with a yellow bill, white tail feathers, pale blue skin around eye, blackish feet and bare dark blue throat. Like other hornbills, the species is sexually dimorphic. The male has a rufous/buff face and neck, orange-red eyes, and a high red casque on the top of his bill. The female has a black face and neck, a yellow casque, and brownish eyes.
An Indonesian endemic, the knobbed hornbill is found in Sulawesi, Buton, Lembeh, Togian and Muna Island. It inhabits evergreen forest at an elevation of up to 1,800 m and also makes use of secondary forest, woodland and plantations for foraging.
As with other hornbills, the knobbed hornbill is believed to be monogamous. Its diet consists mainly of fruits, but it will also take insects and small vertebrates. Breeding season spans 27–30 weeks and appears to be triggered by a dramatic reduction... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tangkoko Nature Reserve | 🇮🇩 Indonesia |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Busch Gardens Tampa | 🇺🇸 United States | |
| 2 | SeaWorld San Diego | 🇺🇸 United States | |
| 3 | Walsrode World Bird Park | 🇩🇪 Germany | |
| 4 | Minnesota Zoo | 🇺🇸 United States | |
| 5 | Bronx Zoo | 🇺🇸 United States | |
| 6 | St. Augustine Alligator Farm Zoological Park | 🇺🇸 United States | |
| 7 | Johor Zoo | 🇲🇾 Malaysia | |
| 8 | Sunken Gardens | 🇺🇸 United States | |
| 9 | Bangkok Aquarium | 🇹🇭 Thailand | |
| 10 | Batu Secret Zoo | 🇮🇩 Indonesia | |
| 11 | Lembang Park & Zoo | 🇮🇩 Indonesia | |
| 12 | Vogelpark Bali | 🇮🇩 Indonesia |
Very likely
About 70% of wildlife watchers report a Knobbed Hornbill sighting in Tangkoko Nature Reserve on a given day, based on 812 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 4th most-seen of the 138 birds we can rate there. Over three days the chance rises to over 90%, if each day is a fresh chance.
July and September
In those months about 80% of wildlife watchers report a Knobbed Hornbill in Tangkoko Nature Reserve on a given day, against about 50% in November and December, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Knobbed 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.
Only Tangkoko Nature Reserve, in our data
Tangkoko Nature Reserve is the only park on Wallace's Line with enough records to rate Knobbed Hornbill sightings: about 70% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Knobbed Hornbill is recorded against all the birds logged in Tangkoko Nature Reserve (812 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.
