Water rail : Any one of numerous species of rails of the genus Rallus, as the common European species (Rallus aquaticus). See Illust. of Rail.

Example:


Taxonomy
Water Rail, Rallus aquaticus, free encyclopedia, species, Birds, Rails, reedbeds, adults, blue-grey, indicus, Anderton, least concern, breeding season, search, aquatic, the Common, Gallinula chloropus, Kingdom.

Defination from the web:
Water Rails are permanent residents in western and southern Europe, with numbers augmented by migrants in winter. ... Water Rails are very secretive in the breeding season, and are then mostly heard rather than seen. ...