The Biggest Bird!

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/accounts/information/struthio_camelus.html
http://animals.sandiegozoo.org/animals/ostrich
https://www.birdnote.org/show/flightless-birds-evolving-inability-fly
https://blogs.scientificamerican.com/tetrapod-zoology/ratites-in-trees-the-evolution-of-ostriches-and-kin-and-the-repeated-evolution-of-flightlessness-ratite-evolution-part-ii/
http://www.fao.org/docrep/v6200t/v6200T02.htm