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Australian ornithologists for a long time studying flightless birds and in particular the Australian emus came to interesting conclusions. Previously, African ostriches, Australian and South American nandu emu was supposed common ancestor.
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In this theory was a "pitfall": the ancestor was supposed to appear after the disintegration of Pangea (a single continent), and, being flightless, could not travel between the continents. Analysis of genes showed two things: firstly, the common ancestor of large flightless birds were not, and secondly, their ancestors were no bigger than a dove, and thirdly, they could fly.
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