Rhabdotorrhinus corrugatus
Silhouette: Charles J. Sharp and T. Michael Keesey · PhyloPic
In 3 days ~90% in a week >90%
The wrinkled hornbill or Sunda wrinkled hornbill (Rhabdotorrhinus corrugatus) is a medium-large hornbill which is found in forest in the Thai-Malay Peninsula, Sumatra and Borneo. The wrinkled hornbill is around 70 cm long, and has a very large bill that is fused to the skull. It has mainly black plumage, a blue eye-ring, and a broadly white or rufous-tipped tail. The male and female have different head and bill patterns. Males have bright yellow feathers on the auriculars, cheeks, throat, neck-sides and chest, but these areas are black in the female, except for the blue throat. The bill of the male is yellow with a red base and casque, and a brownish basal half of the lower mandible. The bill and casque of the female is almost entirely yellow.
This is a forest species and eats mainly fruit, such as figs, although it will also eat small animals such as frogs and insects. Wrinkled hornbills do not drink, but get the water they need from their food. Their call is a harsh "Kak-kak", or a deep "Row-wow" which can be heard for miles.
These birds are monogamous and remain in a pair for life. They use holes found in trees for nests, and the female will plaster over the entrance with mud and droppings, leaving a nesting mother and her chicks only a small hole, too small for them to exit. They are fed exclusively by the male, who regurgitates food for them. After several months, when the chicks are ready, the female will break out of her nest.
Wrinkled hornbills were first bred in captivity in 1988. Heavy deforestation in their forest habitat has led them to be uplisted from near threatened to endangered on the IUCN Red List in 2018. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia | |
| 2 | Danum Valley Conservation Area | 🇲🇾 Malaysia | |
| 3 | Gunung Leuser National Park | 🇮🇩 Indonesia | |
| 4 | Taman Negara National Park | 🇲🇾 Malaysia | |
| 5 | Sepilok | 🇲🇾 Malaysia | |
| 6 | Kinabalu Park | 🇲🇾 Malaysia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | San Diego Zoo | 🇺🇸 United States | |
| 2 | Tulsa Zoo | 🇺🇸 United States | |
| 3 | Bioparque Estrella | 🇲🇽 Mexico | |
| 4 | Toronto Zoo | 🇨🇦 Canada | |
| 5 | Badoca Safari Park | 🇵🇹 Portugal | |
| 6 | Sedgwick County Zoo | 🇺🇸 United States | |
| 7 | Chester Zoo | 🇬🇧 United Kingdom | |
| 8 | Moody Gardens | 🇺🇸 United States | |
| 9 | National Zoo of Malaysia | 🇲🇾 Malaysia | |
| 10 | Fort Worth Zoo | 🇺🇸 United States | |
| 11 | Honolulu Zoo | 🇺🇸 United States | |
| 12 | Zoo Atlanta | 🇺🇸 United States | |
| 13 | Point Defiance Zoo & Aquarium | 🇺🇸 United States | |
| 14 | Turtle Back Zoo | 🇺🇸 United States | |
| 15 | Vogelpark Avifauna | 🇳🇱 Netherlands | |
| 16 | Georgia Aquarium | 🇺🇸 United States | |
| 17 | Tracy Aviary | 🇺🇸 United States | |
| 18 | Zoo El Pantanal | 🇪🇨 Ecuador | |
| 19 | Zoo Lagos | 🇵🇹 Portugal | |
| 20 | Johor Zoo | 🇲🇾 Malaysia | |
| 21 | Zoo de Lourosa | 🇵🇹 Portugal | |
| 22 | OdySea Aquarium | 🇺🇸 United States | |
| 23 | Blue Planet Aquarium | 🇬🇧 United Kingdom | |
| 24 | Bangkok Aquarium | 🇹🇭 Thailand | |
| 25 | Hidden Acres Rescue for Thoroughbreds | 🇺🇸 United States | |
| 26 | Schildpaddencentrum | 🇳🇱 Netherlands |
Likely
About 50% of wildlife watchers report a Wrinkled Hornbill sighting in Kinabatangan Wildlife Sanctuary on a given day, based on 1,370 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 18th most-seen of the 231 birds we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
January and June–July
In those months about 60% of wildlife watchers report a Wrinkled Hornbill in Kinabatangan Wildlife Sanctuary on a given day, against about 40% in May and September–October, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Wrinkled Hornbill sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
Yes
Of the 6 parks where we can rate Wrinkled Hornbill sightings, Kinabatangan Wildlife Sanctuary has the highest daily chance: about 50%. Next come Danum Valley Conservation Area (Malaysia, about 10%) and Gunung Leuser National Park (Indonesia, about 10%).
Same family: Bucerotidae
The closest relatives of the Wrinkled Hornbill that you can see in Kinabatangan Wildlife Sanctuary (family Bucerotidae, Hornbills) are Oriental Pied Hornbill (about 90%), Black Hornbill (about 60%) and Rhinoceros Hornbill (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Wrinkled Hornbill is recorded against all the birds logged in Kinabatangan Wildlife Sanctuary (1,370 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.
