ENIDDENL
Wildlife of Borneo

Bornean ground-cuckoo

Carpococcyx radiceus

A large, secretive cuckoo that walks through Borneo's forest floor and sometimes follows foraging pigs.

Endemic to Borneo
Species details & taxonomy
Species
Carpococcyx radiceus
Genus
Carpococcyx
Family
Cuculidae
Order
Cuculiformes
Class
Aves
Bornean ground-cuckoo — Carpococcyx radiceus
Bornean ground-cuckoo (Carpococcyx radiceus).Christoph Moning · Wikimedia Commons · CC BY 4.0 · Original

A long tail close to the ground

This Borneo endemic is a substantial, long-tailed bird with a dark crown, pale bill and bare skin around the eye. It often remains concealed in forest-floor vegetation. Low, rounded calls can reveal it before it becomes visible. Photographs from Sungai Kapur in 2024–2025 show a juvenile with a darker bill, duller back and less distinct barring than the adults. Adult sex differences are still uncertain; subtle plumage or facial colours should not be treated as a dependable field test.

Sources & references · 2Forktail / Oriental Bird Club · Long & Collar 2002 distribution and natural historyWang Kong Intal, Saiben Peen, Amar-Singh HSS and Pudin R.; Malaysian Bird Report 2/2025:28–34 · Is Sex Differentiation Possible for the Bornean Ground-Cuckoo?

Following a forest forager

The diet includes ground-dwelling invertebrates, with small vertebrates also reported. A particularly striking feeding association involves the bearded pig. At Sungai Ingei in April 2021, camera footage showed two cuckoos closely following a male pig and picking prey from the leaf litter it disturbed. This is evidence that the birds benefit from the pig's digging; it does not establish that the pig benefits in return. Earlier observations also describe birds accompanying sun bears.

Sources & references · 2Forktail / Oriental Bird Club · Long & Collar 2002 distribution and natural historyMannion N.L.M. et al.; BirdingASIA 41:37–47 · New sightings of Bornean Ground-cuckoo Carpococcyx radiceus in Brunei, with notes on habitat preferences and association with bearded pigs

Forest cover and patient listening

Lowland forest, including riverine and swampy landscapes, is important habitat. Recent Brunei camera records also include secondary forest and uneven, hilly ground, so the species is not confined to flat, untouched forest. Most detections in those surveys occurred in the morning, although afternoon records exist. Danum and the lower Kinabatangan have historical records, but seeing this shy bird remains unpredictable. Forest loss threatens its habitat; retaining connected forest protects the ground cover and foraging conditions it uses.

Sources & references · 3Forktail / Oriental Bird Club · Long & Collar 2002 distribution and natural historyMannion N.L.M. et al.; BirdingASIA 41:37–47 · New sightings of Bornean Ground-cuckoo Carpococcyx radiceus in Brunei, with notes on habitat preferences and association with bearded pigsBirdLife International · 2022 Ground-cuckoo assessment discussion and final recommendation

Where to look

A recorded occurrence does not guarantee a sighting or visitor access. Read the area and experience guides for habitat, responsible observation, guiding and current access before choosing a trip. Keep wildlife at a distance and follow local restrictions.

Places with documented occurrence

Related discoveries

Habitats

Nature areas

Primary rainforest in Danum Valley.
Nature areas

Danum Valley Conservation Area

Danum Valley Conservation Area is a protected lowland rainforest landscape in eastern Sabah, reached through Lahad Datu. Its appeal lies in the forest itself: tall dipterocarp trees, shaded trails and the possibility of observing wild animals in a living forest rather than at a feeding platform. Conservation, scientific work and carefully arranged visitor stays share this landscape. For travellers, the practical starting point is a confirmed booking at the Danum Valley Studies Centre or Borneo Rainforest Lodge, with the appropriate transfer and guiding arrangements. These are distinct facilities, not two names for the same accommodation. A stay of several days gives time for forest walks at different hours without letting the access journey dominate the trip. Danum is best approached as a planned forest stay with flexible wildlife expectations, not as an unrestricted drive-in park or a guarantee of seeing its rarest mammals.

Gido (gidovd) · Wikimedia Commons · CC BY 2.0 · Cropped · Original
The Kinabatangan River at Kampung Sukau.
Nature areas

Lower Kinabatangan Wildlife Sanctuary

The Lower Kinabatangan Wildlife Sanctuary protects parts of the forested floodplain along eastern Sabah’s best-known wildlife river. Here the visitor experience is shaped by water: boats follow forest edges, tributaries and river bends while guides look for movement in the canopy and along the banks. Proboscis monkeys are strongly associated with the landscape; orangutans, elephants and many birds also occur, without any sighting being guaranteed. This is not one enclosed park with a single entrance. Lodges and village bases around Sukau, Bilit and Abai serve different stretches of the river, usually with transfers arranged through Sandakan. Choose the base and programme together rather than booking a boat trip against a generic map pin. Two nights give useful space for both morning and evening outings. The sanctuary is also part of a lived-in landscape where river communities, agriculture and wildlife conservation meet.

CEphoto, Uwe Aranas · Wikimedia Commons · CC BY-SA 3.0 · Cropped · Original

Destinations

Primary rainforest in Danum Valley.
Destinations

Borneo

Borneo rewards a journey built around a few contrasting places: a river city, a forest stay, a highland community or an island coast. Indonesia, Malaysia and Brunei share the island, but each part has its own gateways, languages and travel arrangements. Start by choosing the landscapes and experiences that matter most to you; the country and regional guides below turn that choice into a workable route. Sabah combines mountain, forest and sea journeys, Sarawak connects river towns with caves and living heritage, Kalimantan opens five very different provinces, and Brunei offers a compact capital-and-rainforest combination. You can enjoy a substantial first trip within just one of these regions. Seeing the whole island is a much larger undertaking.

Gido (gidovd) · Wikimedia Commons · CC BY 2.0 · Cropped · Original

Related animals

Sources & references

Forktail / Oriental Bird Club · Long & Collar 2002 distribution and natural historyAccessed: 2026-10-04

Cornell BirdNET taxonomy · Bornean Ground Cuckoo accepted nameAccessed: 2026-10-04

BirdLife International · 2022 Ground-cuckoo assessment discussion and final recommendationAccessed: 2026-10-04

Mannion N.L.M. et al.; BirdingASIA 41:37–47 · New sightings of Bornean Ground-cuckoo Carpococcyx radiceus in Brunei, with notes on habitat preferences and association with bearded pigsAccessed: 2026-10-04

Wang Kong Intal, Saiben Peen, Amar-Singh HSS and Pudin R.; Malaysian Bird Report 2/2025:28–34 · Is Sex Differentiation Possible for the Bornean Ground-Cuckoo?Accessed: 2026-10-04

Report a correction