The Eggs

The Eggs are the bird's most desperate items they want in the game like Theme 1-8 's 'boulder". This is why the birds are angry because of the pigs who stole them. For every episode, there are three eggs other than Season's Greedings and Go Green, Get Lucky, which have one, Hogs and Kisses, 2.

Trivia

 * Eggs are the only indestructable object in the entire game (excluding walls and Rubber).
 * The Mighty Eagle can destroy eggs.
 * Anyway, it is unknown if 2 of the 3 Eggs are the Boy and Girl Eggs from Hogs and Kisses.
 * (Note) The Eggs have never hatched and it is likely they never will.
 * There are only three eggs, but in some other media, there are more than three eggs. In the Youtube video Angry birds funny cartoon! there are five eggs because the fourth egg was when the Blue Birds killed the Helmet Pig and the fifth egg was laid by the White Bird, but it might've been a fake egg
 * Some pages in Bad Piggie's Egg Recipies show the Pigs finish cooking the eggs.