Description
The adult of the nominate subspecies is a medium-sized rail, 23–28 cm (9–11 in) long with a 38–45 cm (15–17.7 in) wingspan. Males typically weigh 114–164 g (4.0–5.8 oz) and females are slightly lighter at 92–107 g (3.2–3.8 oz). The upperparts from the forehead to tail are olive-brown with black streaks, especially on the shoulders. The sides of the head and the underparts down to the upper belly are dark slate-blue, except for a blackish area between bill and eye, and brownish sides to the upper breast. The flanks are barred black and white, and the undertail is white with some darker streaks. The long bill and the iris are red, and the legs are flesh-brown. The sexes are similar; although the female averages slightly smaller than the male, with a more slender bill, determining sex through measurements alone is unreliable. The juvenile has a blackish crown and a white chin and throat. The underparts are buff or white with darker bars, and the flank markings are brown and buff, rather than black and white. The undertail is buff, and the eye, bill and leg colours are duller than the adult. The downy chick is all black apart from a mainly white bill. After breeding, the rail has an extensive moult, and is flightless for about three weeks. Individual adults can be identified by the markings on the undertail, which are unique to each bird. Adult males have the strongest black undertail streaks. It has been suggested that the dark barring on the undertail of this species is a compromise between the signalling function of a pure white undertail, as found in open water or gregarious species like the Common Moorhen, and the need to avoid being too conspicuous.
The Water Rail can readily be distinguished from most other reed bed rails by its white undertail and red bill; the latter is a little longer than the rest of the rail's head (55–58% of the total) and slightly down-curved. The somewhat similar Slaty-breasted Rail of tropical Asia has a stouter bill, a chestnut crown and white-spotted upperparts. Juvenile and freshly moulted Water Rails may show a buff undertail like Spotted Crake, but that species' plumage is spotted with white, and it has a much shorter, mainly yellowish bill. The range of the Water Rail does not overlap with that of any other Rallus species, but vagrants could be distinguished from their American relatives by the lack of rufous or chestnut on the closed wing. The larger African Rail has unstreaked darker brown upperparts and brighter red legs and feet.
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