Fig. 7From: Evolution and development of the bird chondrocraniumDevelopment of the prechordal region in Anas platyrhynchos [46]. Lateral view of chondrocranial stages: a stage 8 (7.5 days), b stage 10 (9 days), c stage 11 (9.5 days), and d stage 13 (14 days). Drawings by Timea Bodogán, modified from cited sourceBack to article page