Auckland Islands Rail

The sexes are similar, the females are possibly duller however. A small rail, the Auckland rail measures 17–20 cm (6.7–7.9 in) in length, and four adults were found to weigh 89–100 g (3.1–3.5 oz). Its head and neck are reddish-brown in colour, while it has a grey breast and a brown-black coloured back. Its characteristic call is a loud "kek" or "crek" sound, but it can also make a variety of quieter calls, as well as grunts and clicks. The Auckland rail can fly but only does so very rarely.

Its diet and foraging methods probably very similar to the Lewin's rail, and it probably feeds mainly on invertebrates.

The Auckland rail is active during daylight but may also be active for some time after sunset. It appears to be territorial. It is probably monogamous. One active nest of the Auckland rail was found in November, containing two eggs. The nest is woven of grass and/or sedges. Its incubation period is probably similar to Lewin's rail, which incubates for 19–20 days. Its eggs are cream coloured with brown, red-brown and pale grey spots and blotches. The eggs measure 34 mm × 25 mm (1.34 in × 0.98 in), on average.