Fig. 4 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. 4 Material representing lower bills of Harrisonavis croizeti compared to extinct Leakeyornis aethiopicus and extant Phoenicopterus roseus and Phoenicoparrus minor. H. croizeti (NMB SG 18285a), middle part of the left side, in right lateral (a) and internal (medial; b) views. H. croizeti (NMB SG 18285b), tip of the right side, in lateral (c) and internal (medial; d) views. P. roseus in right lateral (e) view. P. minor in right lateral (f) view. H. croizeti (NMHUK A 2665) in right lateral (g) view. L. aethiopicus (NMHUK A 4384) in right lateral (h) view. Arrow indicates ridging characteristic of flamingo bills. Scale bars 1 cm