Girl Bird

Girl Bird is a bird that is first seen in Angry Birds Seasons. She resembles her husband Red, but has eyelashes, different pupils, thinner eyebrows, lighter spots, and wears a yellow bow on the top of her head (though it is blue in the free version), she is smaller than her husband.

Unlike the other birds, Girl Birds ins't a playable bird that is used in the game, rather it only serves as a background character used in various materials to promote the game, and is also seen in the ending sequence upon completing Hogs and Kisses, alongside a solo Red. A plush toy version of her was released along with a plush toy version of the Female White Bird.

In the youtube channel, Rovio asked the fans which female bird came before, and Ruby was an option, probably referring to her.

Trivia

 * She has become quite popular among fans, and some actually begged Rovio to make her playable in a future update.
 * The feathers on Red's plush is pointing to the left. However, Female Red Bird's plush has the feathers pointed to the right.
 * She can be used as an avatar in Angry Birds Friends.