I hear at level 7, you get a quest where you need to find a Rook Egg and smash it. I never got it...
It sounds fun, I feel like I've missed out on it. =(
I've heard the quest was bugged, or too difficult, or somehow made folks ridiculously unhappy for whatever reason, so the devs are taking it back to their workshop, my dear! (I also think it may be coming baaaaack!)