Flightless bird

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

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What Wikipedia says

Flightless birds are birds that cannot fly, as they have, through evolution, lost the ability. There are over 60 extant species, including the well-known ratites (ostriches (Struthio), emus (Dromaius), cassowaries (Casuarius), rheas, kiwis (Apteryx)), and penguins (Sphenisciformes).

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

Image: Pycraft, William Playne, No restrictions, via Wikimedia Commons.