Fig. 3 in New cranial material of the earliest filter feeding flamingo Harrisonavis croizeti (Aves, Phoenicopteridae) informs the evolution of the highly specialized filter feeding apparatus

Fig. 3 Sub-adult and adult upper bills from Harrisonavis croizeti compared to extinct Leakeyornis aethiopicus and adult extant Phoenicopterus roseus and Phoenicoparrus minor. Sub-adult H. croizeti (NMB MA 9594) in dorsal (a), ventral (b), and right lateral (n) views. Adult H. croizeti (FSL 442292) in dorsal (c), ventral (d), and right lateral (o) views. Adult P. roseus in dorsal (e), ventral (f), and right lateral (l) views. Adult P. minor in dorsal (g), ventral (h), and right lateral (m) views. L. aethiopicus (NMHUK A 4382) in dorsal (i), ventral (j), and right lateral (k) views. ct crista tomialis, mk maxillary keel; nf nasal furrows. Arrows indicate reticulated surface unique to extant flamingos. Arrowhead indicates fibrous texture on dorsal surface of NMB MA 9594, suggesting the bill belonged to a subadult individual. Scale bars 1 cm