There are all sorts of flying birds, but some of the world's biggest are ones that stick to the ground, like the awesome ostrich!

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SOURCES:

https://animaldiversity.org/site/acco...
http://animals.sandiegozoo.org/animal...
https://www.birdnote.org/show/flightl...
https://blogs.scientificamerican.com/...
http://www.fao.org/docrep/v6200t/v620...