User blog comment:Fusedtwilight/A theroy about Leah/@comment-4475299-20120105235819/@comment-2020973-20120106000638

I am sure the other wolves have the extra ones as well. Who knows, maybe the wolves are evolving and Leah is the first in a soon to be long line of female wolves. Hopefully if SM ever rights another book it might explore more on the wolves genetics or more about their nature. Because don't forget Aro did mention other types of shape-shifters.