Superb lyrebird

The superb lyrebird is a large, pheasant-sized terrestrial passerine, ranging in length from 860 mm (34 in) for the female to 1 m (39 in) for the male. Females weigh around 0.9 kg (2.0 lb), and males weigh around 1.1 kg (2.4 lb). The plumage colour is mainly dark brown on the upper body, with greyish-brown underparts and red-tinged flight feathers, its feathers are brighter tail than that of Albert's lyrebirds. The wings are short and round, and are only capable of weak flight, being mainly used for balance or for gliding from trees to the ground. The legs are powerful, capable of running quickly, and the feet are strong enough to move branches up to 10 cm in diameter.

Adult males have tails up to 70 cm (28 in) long, consisting of sixteen feathers. There are outer two feathers broad and S-shaped named "lyrates" for their resemblance to the shape of a lyre, they have brown and buff coloured patterning. Lyrates of superb lyrebirds are larger than of Albert lyrebirds. Between the lyrates are twelve filamentaries, feathers of flexible silvery barbs. In the centre of the tail are two silvery median feathers. The tail of the female is less ornate, with shorter lyrates and plain, broad feathers in place of the filamentaries.

In both sexes, juveniles have no ornamental tail feathers. The tail plumage develops into that of the mature bird through a series of annual moults, with feathers undergoing change in structure and patterning. The male superb lyrebird reaches maturity in 7–9 years, and the female in 6–7 years.