It's safe to say that everyone is probably going to have a different opinion on the direction to take both flyer based and land based creatures in the game. In terms of the direction we're planning taking now, we'll be tackling flying creatures across the board in most parts. You can expect to see changes to speed, stamina, weight and health (in some cases). Obviously, this is subject to change before the patch goes live (based on in-house feedback) as well as once the patch has gone live (