Talk:The Crystalling Pt. 1/@comment-23858349-20160305235025/@comment-4531340-20160306011806

It probably has to do more with magic - when they're first born, they instinctively know how to channel it properly through the wing musculature that they're born with, but as they grow up and that wing musculature changes, they can no longer just instinctively channel the magic through their wings in order to fly - they must relearn with their new musculature (though once they learn to do that, they never forget how). If I worked on the show, that would totally be my explanation for it anyway.

I always remember how, when Tirek stole the magic from those Pegasi, they were rendered flightless (so it's not just musculature but also magic that is indirectly manipulated).