Biebuyck, D.P. et Van den Abbeele, N., The Power of Headdresses, Bruxelles, 1984, p.63, pl.11. The authors state that the faces represent Oduduwa, first king and mythical founder of the Yoruba, and express supernatual power. The bird finial symbolises mystic communication with the gods through magical flight. The bird represented here is okin, the royal bird, a small white bird with long tail feathers.