Gouldian Finch

Overview

The Gouldian Finch is among the most vividly colored birds on Earth, native to the tropical savanna belt of far northern Australia. It is a small, short-tailed grass finch with a grass-green back and wings, a lilac-purple breast, and a bright yellow belly.

Plumage

The species is best known for its head color polymorphism: individuals occur with a black head, a red head, or (rarely) a yellow/orange head, all set against the same green-and-purple body. Both sexes show the same pattern, though females are slightly duller than males. Juveniles are dull olive-grey overall and lack the adult head colors until their first molt.

Field Marks

• Small finch with a stubby pale bill, green back and wings, purple chest, and yellow underparts
• Head is black, red, or (uncommonly) yellow, edged with a thin pale blue band separating it from the body color
• Adults have a fine hair-like extension to the central tail feathers, most visible in males

Similar Species

No other Australian finch combines this exact color combination, making adults essentially unmistakable. Duller, olive-grey juveniles can be confused with young grass finches of other species but usually associate with adult Gouldian Finches, which aids identification.

Habitat & Range

Gouldian Finches inhabit open eucalypt savanna and tall-grass woodland across the far north of Australia, from the Kimberley region of Western Australia through the Top End of the Northern Territory to Cape York Peninsula in Queensland. They depend on a patchwork of habitats through the year: tall grasses for seeding food, sparse woodland with tree hollows for nesting, and permanent waterholes for drinking, especially through the long dry season.

The species is nomadic rather than truly migratory, moving locally in response to seed availability and water. Populations have contracted significantly from their historic range, and the bird is now most reliably found in a scatter of strongholds across the tropical north.

Behavior

Gouldian Finches are highly social, gathering in small to large flocks outside the breeding season, often mixing with other grass finch species at waterholes. Flight is fast and direct, typically low over grassland between feeding and drinking sites.

Voice

Calls are soft, high, wheezy contact notes and thin whistles; the song is a quiet, warbling series of notes, far less loud or complex than many other songbirds.

Feeding

Birds forage on the ground and on grass seed heads, taking ripening and fallen seeds of native sorghum grasses as a dietary staple, switching to insects when raising young.

Nesting & Breeding

Breeding follows the wet season when grass seed is abundant. Pairs nest in tree hollows, sometimes in old termite mounds or old nests of other hollow-using birds, laying clutches of four to eight white eggs that both parents incubate and tend.