Skull of Colaptes melanochloros at different postnatal stages: days 13–14 (A, B), days 15–16 (C, D), and days 20–21 (E, F). A ventral view, B right lateral view, C dorsal view, D right lateral view, E ventral view, F detail of the left margin of E, showing the cartilage of the rostral process. Scale bars: 10 mm (A–E), 2 mm (F).