Board Thread:General Discussion/@comment-72.161.235.175-20150929151551/@comment-4010415-20151001203239

If they're half Faunus, Raven could've presented with physical traits, while Qrow didn't.

If they're not, Raven might have tied the feathers into her hair as part of her disguise. That, or she really likes feathers.

Or it could have something to do with Qrow's apparent affinity with crows.