Noisy Scrub-bird

Atrichornis clamosus has greater than 80% of its range within O'Connor

The Noisy Scrub-bird is a medium-sized bird in which the sexes differ markedly in size. Males are about 23 cm in length and weigh 46–58 g, while females are about 19.5 cm in length and weigh 25–37 g. The adults are mostly dark brown above with faint dark barring and rufous wings. They are off-white or buff below, merging to rufous brown on the vent, with dark brown irides, a grey-brown and pink bill and pink-brown or silver-grey legs and feet. The adult male has a diagnostic blackish triangle on the throat and foreneck that is highlighted by bold white stripes on the side of the chin and throat. In contrast, the adult female lacks or has only a trace of the dark marking on the throat and foreneck, and lacks the white stripes along the sides of the throat. Juvenile birds can be distinguished from the adults on the basis of the rich and mainly uniform rufous-brown plumage and yellow gape. Immature birds appear like a duller version of the adult female, but the difference is sufficient for them to be distinguished from the adults. The Noisy Scrub-bird is usually observed singly. Most encounters are with single territorial males, although it is assumed that each territorial male is associated with a female or females that are generally unseen.¹

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