I seem to remember reading something about the embryo always developing the same way in the egg. Like, when they're all curled up their head is always bent in the same direction and under the same wing. Can't remember if it was the left or right wing now. But if they always grow the same way I...
I can't believe this is something I never wondered about before.
Is it always anticlockwise? (Egg in carton, pointy end down, looking down on it from above...)