black bird with red mask resting on the ground

africa angola animal background beak beautiful big bird bizarre black brown bucerotiform bucorvidae bucorvus calao carnivorous chicken cock colorful conspicuous farm feather feathers grass green ground gular hornbill kenya leadbeateri male man mask natural nature omnivore peak pheasant plumage poultry red resting rooster sack saharan south southern sub sureaplusmn tanzania terrestre white wild wildlife wings