Pigs might

Fly? Pigs? Why not? Why haven't pigs evolved with wings?

In fact, why don't more creatures have wings? And why does being a mammal with arms and legs seem to preclude us from flight? The world would be a better, perhaps even a happier, place if more creature could fly.

Imagine it. Sheep somersaulting through the air (think Monty Python). Zebras able to reach top branches of trees. Pigs floating gently through the sky. Cows dive-bombing innocent ramblers...

Next time the universe is re-set, I hope the gods will give this some consideration.