The Eggs are the things that the pigs steal and the thing that the birds care about. They hatched and here are the characters.
The Brown Bird's ability is to ricochet; go back. It is like the Boomerang Bird, but not like a boomerang.
The Burgundy Bird can bounce where ever it hits. It can only smash wood and glass.
The Gray Bird can slice materials like a saw or a light saber.