Female Pig

There are four known instances of Female Pigs, two appearing in the Angry Birds Seasons episode Hogs and Kisses, one in the Angry Birds Bing Videos, and one in the King Pig Mode.

Female Pig (Credits)
This Female Pig is the size of a large pig and wears a pink bow and eye make-up. This pig is seen in the credits of the game and in promotional images, as well as appearing in the game. A plush toy was made of this Female Pig. In the scene she appeared in, the Moustache Pig fell in love with her.

Female Pig (In-Game)
The second Female Pig is a meduim pig and has a big red bow. It first appears in level 1-1 of Hogs and Kisses, however, it's just a normal pig with a pink bow. There is also a female pig with a small pig on a boat in Piglantis 1-8, and an apperance in the Golden Mooncake level.

Female Pig (King Pig Mode)
A Female Pig appears in the King Pig Mode in the original Angry Birds. This pig resembles the one in Hog and Kisses's credits, only with pink blush. The Female Pig only appears in levels where the Pink Bird appears, so she shares the Pink Bird's power to blow bubbles.

Cardboard Cutout
A cardboard cutout Female Pig wearing a blonde wig is seen in the Angry Birds Bing Videos. This cutout was used by the Birds to get back their eggs the pigs stole