Birdday Party

 is the seventh Angry Birds episode. It celebrates the 2-year anniversary of Angry Birds.

Rovio first introduced the episode on their blog. It has 15 levels, and all episodes of the original Angry Birds will be unlocked. Many book and toy stores across the world will be celebrating.

Golden Egg
In Level 18-6, it's squared. You must zoom out and use the Yellow Bird up higher to get it.

Trivia

 * Fans in the US celebrated by heading over to their local Barnes & Noble, which had special events and giveaways from 11 AM to 3 PM. Angry Birds aficionados joined a scavenger hunt to find the Mighty Eagle or enter a raffle to win special Angry Birds prizes.
 * Toys ‘R’ Us is got into the “birthday” spirit. Fans got 25% off Angry Birds plush toys plus a code that unlocks an Angry Birds Google Chrome bonus level.Most stores went out of plushies quickly.
 * For Angry Birds fans in Japan, Rovio CMO and Mighty Eagle Peter Vesterbacka gave a special presentation at the Apple store in Ginza.
 * The Forbidden Planet stores in the UK also celebrated Angry Birds’ second birthday with merchandise previously unavailable in the UK.
 * This is the first Angry Birds episode that involves an anniversary.
 * This episode has the fewest amount of levels, with only 15.
 * The title is a reference to the saying "Birthday Party",when the birds are having their birthday party.
 * This is the first time the Orange Bird appears in the original Angry Birds game.
 * After this update, the angry birds loading screen will change to the new one.
 * On the pause menu there is a picture of the New York map, saying: Coming Soon !!!
 * Destroying a birthday cake in the game gives you 3000 points.
 * This is the only chapter in Angry Birds where the King Pig doesn't appear on the last level of a theme.