 The invisible rail , Wallace 's rail , or drummer rail ( Habroptila wallacii ) is a large flightless rail that is endemic to the island of Halmahera in North Maluku , Indonesia , where it inhabits impenetrable sago swamps adjacent to forests . Its plumage is predominantly dark slate @-@ grey , and the bare skin around its eyes , the long , thick bill , and the legs are all bright red . Its call is a low drumming sound which is accompanied by wing @-@ beating . The difficulty of seeing this shy bird in its dense habitat means that information on its behaviour is limited . 
 The invisible rail , Wallace <a href='null_genetive' title='1'><mark>'s</mark></a>rail , or drummer rail ( Habroptila wallacii ) <a href='drop_aux' title='2'><mark>is</mark></a>a large flightless rail <a href='null_relcl' title='3'><mark>that</mark></a><a href='drop_aux' title='4'><mark>is</mark></a>endemic to the island of Halmahera in North Maluku , Indonesia , where it <a href='uninflect' title='5'><mark>inhabits</mark></a> impenetrable sago swamps adjacent to forests . Its plumage <a href='drop_aux' title='6'><mark>is</mark></a>predominantly dark slate @-@ grey , and the bare skin around its eyes , the long , thick bill , and the legs <a href='drop_aux' title='7'><mark>are</mark></a>all bright red . Its call <a href='drop_aux' title='8'><mark>is</mark></a>a low drumming sound which is accompanied by wing @-@ beating . The difficulty of seeing this shy bird in its dense habitat <a href='uninflect' title='9'><mark>means</mark></a> that information on its behaviour is limited . 
The invisible rail , Wallace  rail , or drummer rail ( Habroptila wallacii ) a bigass flightless rail endemic to the island of Halmahera in North Maluku , Indonesia , where it inhabit impenetrable sago swamps adjacent to forests . Its plumage predominantly dark slate @-@ grey , and the bare skin around its eyes , the long , thick bill , and the legs all bright red . Its call a low drumming sound which is accompanied by wing @-@ beating . da difficulty of seeing dis shy bird in its dense habitat mean dat information on its behaviour is limited .