Hmm, it's between eagle and dragon for me.
A dragon would be really useful for me to switch into (because that's what my char's do), but then again
everyone will be a dragon, and FeralHeart will lose what it was created for.
Eagles would be good, because this game isn't really fantasy, it's real animals made to look different. I suppose you could customise your eagle and put different patterns and beak shapes on it and be able to fly high.
Meh, really tough decition. But as it looks like dragons are going to win, I am going to vote for the eagles, maybe then FeralHeart will make them both.