Introduction
The Banded Bay Cuckoo (Cacomantis sonneratii), also known as the Bay-banded Cuckoo, is a medium-sized cuckoo of the family Cuculidae. It occurs across the Indian subcontinent and much of tropical South and Southeast Asia. Although it is often difficult to see in dense vegetation, its clear, repeated calls can reveal its presence.
Physical Description
The Banded Bay Cuckoo is approximately 23–24 centimetres long. It has a slender body, a relatively long tail and a dark, slightly curved bill. Adults have rich rufous or bay-coloured upperparts marked with dark bars, finely barred whitish underparts and a broad white supercilium above the eye. The tail is rufous, with a dark subterminal band and narrow white tips.
The sexes are broadly similar in appearance. Juveniles are generally more heavily marked above, with paler buff barring on the head and upperparts. Their lower mandible may be yellowish to orange-yellow. Plumage variation occurs across the species’ wide range, so local field experience and vocal identification can be useful.
Range and Habitat
The species is distributed from the Indian subcontinent eastwards through southern China and mainland Southeast Asia. It also occurs in parts of the Thai-Malay Peninsula and on islands including Sumatra, Borneo, Palawan and Java. It is generally regarded as resident, although seasonal or regional movements may occur in parts of its range.
Banded Bay Cuckoos use evergreen and deciduous forest, forest edges, secondary woodland, plantations, scrub and some well-wooded gardens and parks. They are most often associated with lowlands and lower hill forests, although they can occur at moderate elevations. In Nepal, for example, the species is an uncommon resident in Chitwan National Park and is less frequent elsewhere.
Where to See This Species
Chitwan National Park, Bagmati Province, Nepal
The Banded Bay Cuckoo is recorded as an uncommon resident in Chitwan National Park. Forest, woodland and forest-edge habitats provide suitable conditions, although the species may be easier to detect by its call than by sight.
Nearby accommodation: Sauraha is the main gateway settlement, with lodges, guest houses, hotels and other visitor accommodation.
Hampstead Wetlands Park, Singapore
Banded Bay Cuckoo has been recorded at Hampstead Wetlands Park in Singapore. The park’s wetland and surrounding wooded habitats support a diverse bird community, making it a practical place to look for the species in suitable vegetation. It is a resident in Singapore, but sightings are not guaranteed because it can remain concealed in foliage.
Nearby accommodation: Singapore offers a wide range of hotels, serviced apartments and guest houses, with accommodation concentrated around the city and nearby transport corridors.
Behaviour and Diet
The Banded Bay Cuckoo is diurnal and often inconspicuous. It commonly perches quietly within woodland or at the edge of forest, then makes short flights to capture prey. Its diet consists mainly of insects, especially caterpillars, although other invertebrates are also taken.
The species is frequently heard rather than seen. Its song is a clear, high-pitched series of rapidly delivered notes, often described in field guides with phrases such as “pee-poo” or “pee-pee-poo”. The exact pattern varies between regions and individuals.
Banded Bay Cuckoos are brood parasites. The Common Iora is a well-documented host, particularly in South and Southeast Asia, while bulbuls, minivets and small babblers have also been reported as possible or recorded hosts. Evidence for some proposed host relationships is less secure than for the Common Iora. In documented cases, the cuckoo nestling may remove host eggs or young from the nest, allowing it to receive most or all of the food brought by the foster parents.
Identification Tips
Look for the following combination of features:
- Rufous or bay-coloured upperparts with regular dark barring.
- Very finely barred whitish underparts.
- A conspicuous broad white supercilium above a darker eye-line.
- A rufous tail with a dark subterminal band and narrow white tips.
- A slender, long-tailed shape and secretive behaviour in wooded habitat.
- A distinctive, repeated high-pitched call, often easier to detect than the bird itself.
The white supercilium and finely barred underparts help separate it from the female Plaintive Cuckoo. The Banded Bay Cuckoo also lacks the obvious yellow eye-ring associated with the Sunda Brush Cuckoo. Juveniles may look more heavily barred and less sharply patterned than adults.
Conservation Status
The Banded Bay Cuckoo is listed as Least Concern on the IUCN Red List. It has a broad geographic range and occurs in a variety of wooded habitats, including modified landscapes. Nevertheless, forest clearance, habitat fragmentation and the degradation of breeding habitat may cause local declines, particularly where suitable woodland becomes isolated. Reliable global population figures and a precise population trend are not available in the sources used here.
Frequently Asked Questions
Where is the Banded Bay Cuckoo found?
It occurs from the Indian subcontinent through southern China and mainland Southeast Asia, extending into the Thai-Malay Peninsula and several islands in the region, including Sumatra, Borneo, Palawan and Java.
What does the Banded Bay Cuckoo look like?
It is a slender cuckoo with rufous, dark-barred upperparts, finely barred whitish underparts, a broad white eyebrow and a rufous tail with a dark subterminal band.
What does the Banded Bay Cuckoo eat?
It feeds mainly on insects, especially caterpillars, which it captures from perches or during short sallies through the vegetation.
Is the Banded Bay Cuckoo a brood parasite?
Yes. It lays its eggs in the nests of other birds. The Common Iora is a well-documented host, while other hosts have been reported with varying levels of supporting evidence.
How can the Banded Bay Cuckoo be identified in the field?
Listen for its repeated, high-pitched whistle and search wooded edges and forest for a barred rufous cuckoo with a prominent white supercilium. It is often detected by sound before it is seen.
Is the Banded Bay Cuckoo endangered?
No. The species is currently assessed as Least Concern, although habitat loss and fragmentation may threaten local populations.
References
- BirdLife International
- IUCN Red List of Threatened Species
- National Parks Board, Singapore
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