Green Pigs

The Bad Piggies (or simply The Pigs) are the main antagonists of Angry Birds. The Pigs reappear in Angry Birds Rio as balloons.

They are green pigs who appear as the archenemies of the Angry Birds. This is mainly because the pigs would constantly steal the birds' eggs, angering them.

There are small, medium, and large pigs. The large pigs are the strongest and hardest to kill. They make their first appearances as bosses in the last level of a stage: Throughout the levels of Angry Birds, the pigs can be seen standing on or near obstacles which the player must knock down by launching the Angry Birds from a slingshot. Depending on the impact of the launched bird, the pig may show signs of injury (such as a black eye) if the impact wasn't strong enough. If the impact was strong enough, the pig would vanish into smoke, indicating its defeat. The next level begins once all the visible pigs are killed by the knocked over obstacles.
 * Stage one: Helmet Pig
 * Stage two: Mustache Pig
 * Stage three: King Pig (the largest and leader of the pigs).

Other than plotting and stealing eggs, they do not seem to do much else. They do not pose as much of a threat as they do not fight back when under attack. In fact, in Angry Birds Toons they are shown to be rather incompetent.