Channel-billed cuckoo fact sheet | Field of Mars EEC

What are channel-billed cuckoos?

Channel-billed cuckoos (Scythrops novaehollandiae) are large migratory birds found in northern and eastern Australia. They are the largest cuckoos in the world and are well known for their loud calls, long tails and huge curved bills. These birds arrive in Sydney during spring and summer to breed before migrating north again in autumn.

Channel-billed cuckoos are often noticed because of their noisy screeching calls and dramatic flying displays. They have grey-brown feathers, pale underparts, red eyes and broad wings. Their long tail helps them steer through the air as they move between tall trees in forests, parks and suburban areas.

Unlike most birds, channel-billed cuckoos do not build their own nests or raise their own chicks. Instead, they lay their eggs in the nests of other birds, especially Australian magpies, currawongs, ravens and pied currawongs. This behaviour is called brood parasitism. Students may hear or see channel-billed cuckoos in tall eucalypt forests around Sydney, including bushland near Field of Mars Reserve and Lane Cove National Park during the warmer months.

A channel-billed cuckoo.

Channel-billed cuckoos are mostly grey with a red ring around their eyes.

Where do channel-billed cuckoos live?

Channel-billed cuckoos live across northern and eastern Australia, as well as parts of Papua New Guinea and Indonesia. In Australia they migrate south during spring and summer to breed, then return north during autumn. They are commonly found in rainforests, open forests, woodlands, coastal bushland and suburban areas with tall trees.

In Sydney, channel-billed cuckoos are often seen or heard in parks, school grounds and bushland reserves during the warmer months. They are regularly noticed in areas with large fig trees and nesting birds that can act as foster parents. Students visiting bushland around Field of Mars Reserve or Lane Cove National Park may hear their loud screeching calls high in the tree canopy before spotting the birds themselves.

Channel-billed cuckoos spend much of their time high in tall forest trees.

What do channel-billed cuckoos eat?

Channel-billed cuckoos mainly eat fruit, especially figs from native and introduced fig trees. They also feed on berries, seeds, insects, caterpillars, cicadas and occasionally small birds or eggs. Their strong curved bill helps them grab and swallow large fruits whole.

These birds help spread seeds through forests and urban bushland when they move between feeding areas. By dispersing seeds, they support the growth of native plants and rainforest species. Their feeding behaviour also connects them to seasonal food cycles in Australian ecosystems.

Channel-billed cuckoos eating fruit in a forest canopy.

What do channel-billed cuckoos sound like?

Channel-billed cuckoos are famous for their loud, harsh screeching calls. Their calls are often described as noisy, rising shrieks that echo across suburbs and bushland during spring and summer. Groups of birds may call together while flying over treetops.

These calls help birds communicate during migration and breeding. Many people first notice channel-billed cuckoos by sound before they ever see the birds. Their noisy behaviour is a strong sign that warmer weather has arrived in eastern Australia.

What is the life cycle of channel-billed cuckoos?

Channel-billed cuckoos migrate into southern Australia during spring to breed. Instead of building nests, females lay their eggs in the nests of other large birds such as currawongs, magpies or ravens. Foster parents incubate the eggs and raise the cuckoo chick after it hatches.

Young channel-billed cuckoos grow quickly and can become much larger than the foster parents feeding them. After the breeding season, adults and young birds migrate north again. Channel-billed cuckoos may live for more than 20 years in the wild.

A young channel-billed cuckoo being fed by foster parent birds.

What adaptations do channel-billed cuckoos have to help them survive?

Channel-billed cuckoos have several adaptations that help them survive across large distances and varied habitats. Their broad wings and long tail allow strong, efficient flight during migration. Their large curved bill helps them eat large fruits and capture prey in tree canopies.

Their most unusual adaptation is brood parasitism. By laying eggs in the nests of other birds, channel-billed cuckoos avoid the energy costs of building nests and raising chicks themselves. Their chicks hatch quickly and grow rapidly, increasing their chances of survival before migration season begins.

Channel-billed cuckoos have a beak that helps them collect fruit.

Why are channel-billed cuckoos important?

Channel-billed cuckoos play an important role in Australian ecosystems as seed dispersers and predators of insects and other small animals. By spreading seeds from fruits such as figs, they help regenerate forests and support plant diversity.

These birds are also part of complex food webs and seasonal migration patterns. Their arrival in spring connects Australian ecosystems with broader migratory systems across the Pacific region. Studying channel-billed cuckoos helps scientists understand bird migration, breeding behaviour and changing environments.

Channel-billed cuckoos help spread seeds through forests and bushland.

How can you help channel-billed cuckoos?

People can help channel-billed cuckoos by protecting forests, bushland and large native trees. Planting native trees that provide food and shelter can support migratory birds visiting suburban areas during spring and summer.

Students can also help by respecting wildlife habitats, keeping pets away from nesting birds and learning more about migratory species. Healthy urban bushland and connected habitats help channel-billed cuckoos complete their long seasonal journeys safely.

Large native fig trees provide important food and shelter for channel-billed cuckoos.

Related fact sheets

More bird fact sheets

• Birds – Learn about bird features, habitats and adaptations.
• Australian magpie – Discover a bird that may raise channel-billed cuckoo chicks.
• Pied currawong – Learn about another large bird linked to channel-billed cuckoo breeding.
• Australian raven – Explore another large, intelligent bird found in Sydney bushland.

Habitats and ecosystems

• Habitat – Learn what animals need from their habitats.
• Tree habitats – Discover how trees provide food, shelter and nesting places for birds.

Animals that share this habitat

• Laughing kookaburra – Find out about another bird that uses trees for perching and breeding.
• Noisy miner – Learn about a common Sydney bird that lives in open areas with trees.

Food webs and ecological relationships

• Cicada – Explore an insect food source eaten by many birds.
• Insects – Learn how insects support food webs for birds and other animals.

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