Evolution of the Giant Flightless Birds

The ratites or palaeognaths, animals like Emus, Ostriches and Cassowaries are incredibly interesting animals, being some of the largest birds that have ever existed and possessing many primitive looking features that give them a very unique look. However, they also have a very mysterious past, they are a group of closely related flightless birds yet have a wide spread among most of the southern land masses.

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://academic.oup.com/mbe/article/...
https://dinosaurs.group.uq.edu.au/fil...
https://pubmed.ncbi.nlm.nih.gov/24855...
https://web.archive.org/web/201106100...
https://royalsocietypublishing.org/do...