Why do ostriches, emus, and other flightless birds still have wings?



  1. 0 Votes

    This is because it can take thousands and thousands of generations for a trait to disappear or change. Emus and other flightless birds were at one point able to fly, but over time, they were able to survive on the ground without wasting energy flying, and the wings just sort of stayed on. Unless there is a need for them to evolve an extremity other than the wing, they probably wont be going anywhere for a while.

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