Introduction
The Shining Bronze-Cuckoo (Chalcites lucidus) is a small, iridescent cuckoo of Australasia and the south-western Pacific. It is often detected by its clear, repeated whistle before it is seen moving through foliage. The species is an obligate brood parasite, laying its eggs in the nests of other birds rather than raising its own young.
Physical Description
The Shining Bronze-Cuckoo is a slender cuckoo measuring approximately 13–18 centimetres in length. Adults have glossy green, bronze or coppery upperparts, a pale face and white underparts marked with strong dark barring. The bill is slender and dark, while the feet are dark with yellowish undersides. The under-tail is also dark.
Males and females are broadly similar, although females may show a duller or more purplish sheen on the crown and nape, with warmer tones in the barring. Plumage also varies between geographic forms. Juveniles are generally duller than adults and may show less strongly developed metallic colour and barring.
Range and Habitat
The species occurs across Australia, New Zealand and several islands of the south-western Pacific, including New Caledonia, Vanuatu, the Solomon Islands, Papua New Guinea and parts of Indonesia. It is a full migrant in the broad sense, with seasonal movements between breeding and non-breeding areas.
In New Zealand, the Shining Bronze-Cuckoo is a summer migrant that breeds mainly from October to March before returning north for the cooler months. It occurs in both the North and South Islands, in native forest, regenerating scrub, exotic forest, gardens and other wooded habitats. In Australia, it uses open forest, woodland, rainforest margins, coastal vegetation, parks and gardens. It has been recorded from low elevations to approximately 1,920 metres.
Its distribution is closely associated with suitable host species, particularly small insectivorous birds that build enclosed or domed nests. Geographic forms and host relationships vary across the species’ wide range.
Where to See This Species
Mapara Wildlife Management Reserve, Waikato, New Zealand
The Department of Conservation lists the Shining Bronze-Cuckoo among the native birds that may be heard or seen along the Mapara Track. The reserve’s native forest and regenerating vegetation provide suitable habitat, and the species is most likely to be detected by its call during the New Zealand summer.
Nearby accommodation: Te Kuiti is the nearest practical town for hotels, guest houses, motels and self-catering accommodation.
Te Maire Loop Track, Whanganui National Park, Manawatū-Whanganui, New Zealand
The forest at Te Maire supports a diverse native bird community, including the Shining Bronze-Cuckoo. The best opportunities are during the spring and summer visitor season, when patient observers may hear the cuckoo calling from the forest canopy and edges.
Nearby accommodation: Whanganui is the main gateway for hotels, motels, guest houses, holiday parks and self-catering accommodation.
Peel Forest Park Scenic Reserve, Canterbury, New Zealand
Peel Forest contains mature and regenerating podocarp forest and is documented by the Department of Conservation as habitat for the Shining Bronze-Cuckoo. The species is a seasonal visitor, so spring and summer are the most suitable times to look and listen in forest clearings, tracks and edges.
Nearby accommodation: Geraldine is the nearest recognised accommodation centre, with motels, guest houses, farm stays, holiday parks and self-catering options.
Behaviour and Diet
Shining Bronze-Cuckoos are usually solitary or found in pairs, although individuals may gather in small groups during migration. They spend much of their time in the canopy and are often easier to hear than see. Their repeated, whistling calls are important for communication and are particularly useful for locating birds in dense foliage.
The diet consists mainly of insects and other invertebrates, including caterpillars and beetles. The species is capable of eating hairy or otherwise unpalatable caterpillars that many other birds avoid. It generally forages among leaves and branches, especially in the canopy and outer foliage.
The Shining Bronze-Cuckoo does not build a nest. The female lays a single egg in the nest of a suitable host, often after removing one of the host’s eggs. In New Zealand, the Grey Warbler is the principal host. Other hosts used in different parts of the range include gerygones, thornbills, fairywrens and scrubwrens. After hatching, the cuckoo chick commonly ejects host eggs or nestlings and is then reared by the foster parents. Cuckoo eggs and nestlings may show adaptations that help them avoid detection, including resemblance to host eggs and mimicry of host begging calls.
Identification Tips
- Look for a small, slim cuckoo with glossy green, bronze or coppery upperparts.
- The white face and white underparts with bold dark barring are useful field marks.
- The bird is often concealed in foliage, so listen for its clear, repeated whistle before searching the canopy.
- In New Zealand, the Shining Bronze-Cuckoo is most likely to be encountered during spring and summer.
- Take care when separating it from other bronze-cuckoos. Compare the face pattern, extent and character of the barring, bill colour, tail markings and calls rather than relying on the metallic colour alone.
Conservation Status
The Shining Bronze-Cuckoo is classified as Least Concern on the IUCN Red List. Its global population has not been quantified, but the population is currently considered stable and the species has a very large geographic range.
The main conservation concerns are habitat loss and degradation, together with the wider effects of introduced predators and environmental change on both the cuckoo and its host species. Protecting native forest, woodland, scrub and healthy host-bird populations is important for maintaining the ecological relationships on which its breeding strategy depends.
Frequently Asked Questions
Where does the Shining Bronze-Cuckoo live?
It occurs in Australia, New Zealand and several islands of the south-western Pacific, including New Caledonia, Vanuatu, the Solomon Islands and parts of Melanesia and Indonesia.
Is the Shining Bronze-Cuckoo migratory?
Yes. It is a full migrant across its range. Birds breeding in New Zealand leave for northern regions after summer, while populations elsewhere make seasonal movements that vary by location.
What does the Shining Bronze-Cuckoo eat?
It feeds mainly on insects and other invertebrates, especially caterpillars and beetles. It can consume hairy or chemically defended caterpillars that are avoided by many other birds.
Does the Shining Bronze-Cuckoo build a nest?
No. It is a brood parasite that lays its egg in the nest of another bird. The host then incubates the egg and raises the cuckoo chick.
Which bird raises Shining Bronze-Cuckoo chicks in New Zealand?
The Grey Warbler is the principal host in New Zealand. Other small insectivorous birds serve as hosts in different regions of the species’ range.
When is the best time to see this species in New Zealand?
Spring and summer are the best seasons, generally from October to March. The bird is often heard calling from forest or scrub before it is seen.
References
- BirdLife International
- New Zealand Birds Online
- New Zealand Department of Conservation
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