Céréopse cendré

The Cape Barren goose (Cereopsis novaehollandiae) is a large goose resident in southern Australia. The species' common name is derived from Cape Barren Island, where specimens were first sighted by European explorers. It is known in the local Jardwadjali language as toolka. The Cape Barren goose was first described by English ornithologist John Latham in 1801 under the current binomial name. It is a most peculiar goose of uncertain affiliations (Sraml et al. 1996). It may either belong in the "true geese" and swan subfamily Anserinae or in the shelduck subfamily Tadorninae as distinct tribe Cereopsini, or be separated, possibly including the prehistorically extinct flightless New Zealand geese of the genus Cnemiornis, in a distinct subfamily Cereopsinae. The first bones of the New Zealand birds to be discovered were similar enough to those of the Cape Barren goose to erroneously refer to them as "New Zealand Cape Barren goose" ("Cereopsis" novaezeelandiae). The smaller population of Cape Barren goose in Western Australia is described as a subspecies, Cereopsis novaehollandiae grisea, and named for the group of islands known as the Recherche Archipelago. These are bulky geese and their almost uniformly grey plumage, bearing rounded black spots, is unique. The tail and flight feathers are blackish and the legs are pink with black feet. The short, decurved black bill and green cere gives it a very peculiar expression. The Cape Barren goose is long, weighs and has a wingspan; males are somewhat larger than females. This bird feeds by grazing and rarely swims. Their ability to drink salt or brackish water allows numbers of geese to remain on offshore islands all year round. They are one of the rarest of the world's geese. They are gregarious outside the breeding season, when they wander more widely, forming small flocks. A previous decline in numbers appears to have been reversed as birds in the east at least have adapted to feeding on agricultural land. The breeding areas are grassy islands off the Australian coast, where this species nests on the ground.