The Trumpet Manucode ( Manucodia keraudrenii ) is a medium-sized bird of paradise about 31cm long with an long horn-like head tufts and loose neck feathers . Trumpet Manucode ( Manucodia keraudrenii ) is species of medium-sized , approximately 31 cm long bird in the family Paradisaeidae . It has elongated horn-like head tufts and loose neck feathers .