Palaeognathae

Rarity: Rare

A topic known well beyond its field, found in many languages.

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What Wikipedia says

Palaeognathae (; from Ancient Greek παλαιός (palaiós) 'old' and γνάθος (gnáthos) 'jaw') is an infraclass of birds, called paleognaths or palaeognaths. It is one of the two infraclasses of birds, the other being Neognathae, both of which form Neornithes (equivalent to the class Aves in a narrow sense).

Excerpt from the Wikipedia article “Palaeognathae”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jim Kuhn, CC BY 2.0, via Wikimedia Commons.