Angry Birds Seasons Easter Eggs Golden Egg #12 is located in Angry Birds Seasons Easter Eggs Level 1-6. You have to zoom out and then the golden egg will be revealed on the top of the hill (look on the right of the monitor. Use a yellow bird at the right angle (you have to practice a bit) and at the very right moment click a speed burst so as to get the Golden Egg. The pic will help you:
Like the previous this is a two-parts video. The first part will reveal the golden egg and the second will help you pass the level: