Cape Barren Goose (Cereopsis novaehollandiae)

By /
Image of a Cape barron goose near the water
Birds Goose

Introduction

The Cape Barren Goose (Cereopsis novaehollandiae) is a large, distinctive goose endemic to southern Australia. It is named after Cape Barren Island in Tasmania’s Furneaux Group, where the species was first recorded by European observers. Unlike many geese, it is primarily a terrestrial grazer and can spend much of its time on open grassland, pasture and coastal islands rather than on open water.

Physical Description

The Cape Barren Goose measures approximately 75–100 cm in length. It is a bulky, long-bodied bird with pale silvery-grey plumage, a relatively small head and a short, triangular bill. The most diagnostic feature is the prominent greenish-yellow cere, the fleshy covering at the base of the bill.

Adults have rows of dark markings across the scapulars and wing coverts. The legs are pink to deep red, the feet are black, and the wingtips and parts of the trailing edge appear dark in flight. The sexes are generally alike, although females are usually slightly smaller than males.

Young birds are duller and less strongly marked than adults. The species has a deep, harsh call, and its vocalisations have often been described as grunting or pig-like. Birds are particularly vocal during territorial displays and in flight.

Range and Habitat

The Cape Barren Goose is endemic to Australia. Its natural range includes Tasmania, the islands of Bass Strait, south-eastern Australia, parts of South Australia, and the southern coast of Western Australia, including the Recherche Archipelago. The south-western population is commonly treated as the subspecies Cereopsis novaehollandiae grisea.

The species is most strongly associated with offshore islands containing open pasture, tussock grassland, coastal scrub and low heath. It also uses mainland grasslands, improved pasture and agricultural fields, especially outside the breeding season. Some populations are resident, while others make local or seasonal movements between islands and the mainland in response to food availability. These movements are better described as dispersal than as long-distance migration.

Cape Barren Geese have also been introduced to some locations, including Kangaroo Island. Important areas for observation include parts of Tasmania and Bass Strait, south-eastern Victoria, the Coorong region of South Australia, and suitable coastal areas of south-western Australia.

Behaviour and Diet

Cape Barren Geese are mainly terrestrial grazers. Their diet includes native tussock grasses, pasture grasses, clover, legumes, herbs and succulents. The common island tussock grass, Poa poiformis, is an important food plant in parts of the range. They may feed alongside livestock in paddocks and can use modified habitats where adequate pasture remains available.

The species is less dependent on water than most geese. It can drink saline or brackish water and often feeds on land, although it is capable of swimming and flying strongly. Birds are generally social outside the breeding season and may gather in flocks. During breeding, pairs establish and defend territories with calls, posturing and aggressive encounters.

Pair bonds are long-lasting. Breeding commonly occurs from autumn into spring, with July to September a typical breeding period in south-eastern populations. The male helps construct a shallow nest in tussock or other low vegetation and lines it with grass and down. The female usually lays four to six creamy or off-white eggs and incubates them for about 35 days. Goslings are precocial, leaving the nest soon after hatching, while both parents protect and tend the young.

Identification Tips

  • Look for a very large, pale-grey goose with a compact head and heavy body.
  • The prominent greenish-yellow cere almost conceals the short bill and is the quickest identification feature.
  • Rows of dark spots across the shoulders and wing coverts are visible at close range.
  • Pink to reddish legs, black feet and dark wingtips are useful supporting features.
  • On the ground, the species has a deliberate, upright walk and often grazes in open paddocks or coastal grassland.
  • In flight, the pale body contrasts with the dark wingtips and trailing wing edges.
  • Its deep, harsh or grunting call is especially noticeable when birds are displaying, alarmed or flying.

The Cape Barren Goose can resemble a large domestic goose at a distance, but its greenish-yellow cere, patterned grey plumage, pink legs and dark wingtips provide a reliable combination of field marks.

Conservation Status

The Cape Barren Goose is assessed globally as Least Concern on the IUCN Red List. The species was heavily hunted in the past and was considered close to extinction in some areas by the mid-twentieth century. Protection, regulation of hunting and the safeguarding of island habitats helped populations recover.

The global assessment should not obscure important regional differences. The south-western form, Cereopsis novaehollandiae grisea, is listed as Vulnerable under Australia’s national environmental legislation. Local populations may also be affected by habitat degradation, excessive grazing, agricultural development, disturbance during nesting, and predation or other impacts from introduced animals.

Conservation measures include protection of breeding islands, management of introduced predators, regulation of hunting, monitoring of regional populations and maintaining suitable grassland and coastal habitat. On islands and mainland breeding sites, avoiding disturbance around nests and young birds remains important.

Frequently Asked Questions

Where does the Cape Barren Goose live?

It is found only in Australia, particularly Tasmania, Bass Strait islands, south-eastern Australia and parts of southern Western Australia. It uses offshore islands, coastal grasslands, tussock country, heath and mainland pasture.

Is the Cape Barren Goose migratory?

No. The species is not a long-distance migrant, but some populations make local or seasonal movements between islands and the mainland, especially when food availability changes.

What does the Cape Barren Goose eat?

It mainly grazes on grasses, tussock, clover, legumes, herbs and succulents. It also feeds on improved pasture and some agricultural crops where these are available.

How can the Cape Barren Goose be identified?

The best field marks are its large pale-grey body, prominent greenish-yellow cere, pink or reddish legs, dark wing markings and rows of dark spots across the shoulders and wing coverts.

When does the Cape Barren Goose breed?

Breeding varies geographically, but it generally occurs from autumn into spring. In south-eastern populations, July to September is a commonly reported breeding period. Clutches usually contain four to six eggs, which take about 35 days to hatch.

Is the Cape Barren Goose threatened?

The species is classified globally as Least Concern, although some regional populations and forms have higher conservation status. The south-western subspecies, Cereopsis novaehollandiae grisea, is listed as Vulnerable in Australia.

References

Views: 1,662

Related posts

Scroll to Top