Burung purba transisi dari dinosaurus ke burung modern. Tidak dapat terbang dari zaman kapur akhir.

Bacaan lanjut
Chiappe, LM (1995), The first 85 million years of avian evolution. Nature 378: 349-355. Aves, Carinatae, Metornithes, Mononykus, Ornithothoraces, Ornithurae.

Chiappe, LM & CA Walker (2002), Skeletal morphology and systematics of the Cretaceous Euenantiornithes (Ornithothoraces: Enantiornithes), in LM Chiappe & LM Witmer [eds.], Mesozoic Birds: Above the Heads of the Dinosaurs. Univ. Calif. Press. pp. 240-267.

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