Scrubbirds: The Secretive Ground-Dwellers of Australia
In the dense undergrowth of the Australian wilderness live the scrubbirds, members of the family Atrichornithidae. These shy, secretive birds are masters of camouflage, spending most of their lives scuttling through the brush. While they are rarely seen, their presence is often announced by the powerful, ringing calls of the males, which can pierce through heavy vegetation over long distances.
Key Facts
- Species: Only two species exist: the Rufous scrubbird and the Noisy scrubbird.
- Habitat: Native to Australia, occupying dense undergrowth, rain forests, and scrubby gullies.
- Behavior: Primarily ground-dwelling with feeble flight but fast running abilities.
- Conservation: The Noisy scrubbird was once thought extinct until its rediscovery in 1961.
- Lineage: Closely related to lyrebirds, bowerbirds, and treecreepers.
Evolutionary History and Classification
The scrubbird family is an ancient lineage that originated during the great corvid radiation—a period of rapid diversification of crow-like birds—within the Australia-New Guinea region. Taxonomically, they belong to the order Passeriformes (perching birds) and the infraorder Menurides.
Scientific evidence suggests that scrubbirds are most closely related to lyrebirds, and likely share a common ancestry with bowerbirds and treecreepers.
Physical Characteristics and Behavior
Both species of scrubbird are roughly 20 cm in length, similar in size to a common starling. They possess cryptic coloration—drab browns and blacks that allow them to blend seamlessly into their environment to avoid predators.
Unlike many birds, scrubbirds are adept at moving mouse-like under cover. While they are fast runners, their flight is considered feeble, making them highly dependent on the safety of dense vegetation.
The males are known for their extraordinary vocalizations. Their calls are metallic and ringing, possessing a ventriloquial quality (sounding as if they are coming from a different location than the source). These calls are so powerful they can be almost painful to hear at close range. In contrast, the females handle the nesting process, building domed nests close to the ground and taking sole responsibility for raising the young.
The Two Species of Atrichornithidae
The family is divided into two distinct species, each restricted to specific regions of Australia.
The Rufous Scrubbird (Atrichornis rufescens)
The Rufous scrubbird is a rare species with a very restricted range. It is found primarily in the temperate rain forests located near the border of Queensland and New South Wales.
The Noisy Scrubbird (Atrichornis clamosus)
The Noisy scrubbird inhabits the heaths and scrubby gullies east of Albany in Western Australia. This species is a remarkable example of avian recovery; it was believed to be extinct until it was rediscovered in 1961.
Conservation efforts have been vital for the Noisy scrubbird. In 1962, the population was estimated at only 40 to 45 birds. By the mid-1980s, this number grew to approximately 400. Following reintroduction programs at several sites, the population had recovered to around 1,200 birds by 2002, though the species remains endangered.
| Common Name | Scientific Name | Distribution | Primary Habitat |
|---|---|---|---|
| Rufous scrubbird | Atrichornis rufescens | NE New South Wales & SE Queensland | Temperate rain forests |
| Noisy scrubbird | Atrichornis clamosus | East of Albany, Western Australia | Heaths and scrubby gullies |
Frequently Asked Questions
Are scrubbirds good at flying?
No, scrubbirds have feeble flight. They are primarily ground-dwelling birds that prefer to run quickly through dense undergrowth to avoid detection.
Why was the Noisy scrubbird thought to be extinct?
Due to their shy nature, cryptic coloration, and preference for dense cover, they are very difficult to spot. They were not seen for a significant period until their rediscovery in 1961.
What makes the male scrubbird's call unique?
The male's call is metallic, ringing, and has a ventriloquial quality, meaning it is difficult to pinpoint the bird's exact location. It is loud enough to be heard from great distances in heavy scrub.
Who raises the young in a scrubbird nest?
The female scrubbird is solely responsible for raising the young after building a domed nest close to the ground.
Which other birds are related to scrubbirds?
Scrubbirds are most closely related to lyrebirds, and are likely related to bowerbirds and treecreepers as well.