The Glossy-mantled Manucode ( Manucodia ater ) is a medium-sized bird of paradise , around 42cm long , glossed green , blue and purple black with a red iris , black bill , long tail and somewhat elongated upper breast and neck feathers . The Glossy-mantled Manucode , Manucodia ater , is a medium-sized , around 42 cm long , glossed green , blue and purple black bird of paradise with a red iris , black bill , long graduated tail and somewhat elongated upper breast and neck feathers .