In Angry Birds for the iPhone and iPad, there are fifteen golden eggs hidden all around the game that you can collect to unlock various things.
Golden Egg 1 – On any level, pause and click the ?, the egg is on the white bird instruction screen
Golden Egg 2 – On Level 5-19, it’s in the upper right of the screen
Golden Egg 3 – On Level 2-2, break the beach ball
Golden Egg 4 – Get 3 stars in every level of Poached Eggs themes 1 through 3
Golden Egg 5 – Get 3 stars in every level of Mighty Hoax themes 4 through 5
Golden Egg 6 – On the main screen hit the i button and watch the credits, then tap the egg at the end
Golden Egg 7 – On Level 1-8, tap the treasure chest
Golden Egg 8 – Double tap the sun on the level select screen
Golden Egg 9 – On Level 4-7, zoom out you’ll see the egg in the top right corner
Golden Egg 10 – On level 6-14, pop the yellow balloon in the lower right corner beneath the treehouse
Golden Egg 11 – On theme 8’s level page, swipe to the left as if you were trying to navigate to theme 9
Golden Egg 12 – Get 3 stars in every level of “Danger Above” themes 6 through 8
Golden Egg 13 – On level 8-15, the egg is hidden under the slingshot platform
Golden Egg 14 – On level 9-14, you’ll see a hard hat on the bottom right, hit it with a boomerang bird
Golden Egg 15 – On level 10-3, hit the duck