It was previously thought that flightless birds evolved from a common flightless ancestor–that the ancestors of emus and ostriches couldn’t fly either. A new theory, published in early 2010, suggests that some birds became flightless when the dinosaurs became extinct. Without dinosaurs roaming around, birds began to explore the ground more and obtain a lot more food! The study suggests that they ate so much, their wings could no longer carry them. Now, it is thought that flightless birds evolved from different species that once flew, which explains how flightless birds ended up on different continents.
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