The coot: ancestral to chickens, sparrows, parrots and giant stink birds
Fulica atra (Linneaus 1758) is the extant coot, a small water bird with large fleshy feet. Here it nests with Chauna, the screamer, but without such a deadly digit zero. The ascending process of the premaxilla spreads laterally beneath a frontal shield, a decoration on the forehead.
Certainly
an underapprciated bird, given the importance of its transitional morphology between basal storks, like the superficially similar trumpeter Psophia, and the clade of screamers + crakes + chickens + sparrows + parrots + the giant stink birds, Dinornis and Gastornis. The smallest of these became good flyers. The rest never did.
This clade
had origins in the Early Cretaceous.
References
Linnaeus C 1758. Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata.
Source: https://pterosaurheresies.wordpress.com/2018/02/11/the-coot-ancestral-to-chickens-sparrows-parrots-and-giant-stink-birds/
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