 The Zapata rail ( Cyanolimnas cerverai ) is a medium @-@ sized , dark @-@ coloured rail , the only member of the monotypic genus Cyanolimnas . It has brown upperparts , greyish @-@ blue underparts , a red @-@ based yellow bill , white undertail coverts , and red eyes and legs . Its short wings render it almost flightless . It is endemic to the wetlands of the Zapata Peninsula in southern Cuba , where its only known nest was found in sawgrass tussocks . Little is known of its diet or reproductive behaviour , and its described calls may belong to a different species . 
