 The invisible rail inhabits the dense , spiky sago swamps of Halmahera , particularly where forest adjoins the boggy areas . Claims that the rail occurs in alang @-@ alang grass are thought to have arisen from confusion with the pale @-@ vented bush @-@ hen . German ornithologist Gerd Heinrich , who prepared for his Halmahera trip by rolling in stinging nettles , wrote of the sago swamp habitat in the 1930s : 
 The invisible rail <a href='uninflect' title='1'><mark>inhabits</mark></a> the dense , spiky sago swamps of Halmahera , particularly where forest <a href='uninflect' title='2'><mark>adjoins</mark></a> the boggy areas . Claims that the rail <a href='uninflect' title='3'><mark>occurs</mark></a> in alang @-@ alang grass are thought to <a href='been_done' title='4'><mark>have</mark></a> arisen from confusion with the pale @-@ vented bush @-@ hen . German ornithologist Gerd Heinrich , <a href='null_relcl' title='5'><mark>who</mark></a>prepared for his Halmahera trip by rolling in stinging nettles , wrote of the sago swamp habitat in the 1930s : 
Da invisible rail inhabit the dense , spiky sago swamps of Halmahera , particularly where forest adjoin the boggy areas . Claims dat the rail occur in alang @-@ alang grass r thought to done arisen from confusion witt the pale @-@ vented bush @-@ hen . German ornithologist Gerd Heinrich , prepared for his Halmahera trip by rolling in stinging nettles , wrote of the sago swamp habitat in the 1930s :