Keywords: PipraWing.jpg Modification of Manakin Pipra deliciosa Machaeropterus deliciosus wings for sound production from Darwin's - The Descent of Man The Descent of Man Volume 2 1871 Charles Darwin using the work of P L Sclater PD-old Machaeropterus deliciosus The Descent of Man and Selection in Relation to Sex 1871 Passeriformes feathers |