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.

Figure 1. The coot (genus: Fulica) is ancestral to the chicken/parrot clade.

Figure 1. The coot (genus: Fulica) is ancestral to the chicken/parrot clade.

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.

Figure 1. More taxa, updated tree, new clade names.

Figure 1. More taxa, updated tree, new clade names.

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.

wiki/Chauna
wiki/Fulica

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