Very large and heavy bird with heavy bill and rounded tail with straight outer tail-feathers. Both sexes lack wing-bars. Males much bigger than females. Plumage mostly black with brown wings and yellowish bill. Females mottled brown with brick-red breast, throat and chin. Lower back greyish, contrasting with rufous, heavily barred, tail.

Display-sounds from male unmistakable. Four phased song: First a slow introductory, double-tapping phase which suddenly bursts into an accelerating crescendo followed by a distinct pop. Then closing with grinding and hissing sounds. Female calls with a deep nasal "kok kok".

Song/display:

Wikipedia: map (se also Xeno-canto below)

Birdlife ecology

Observation.org Latest observations

Video IBC

Image search Flickr NB! May give other species

Sound search at Xeno-canto

Featherbase

CC-sound:Hannu Jännes, Licence,Link.