Golden Egg Level 15 has 1 Big Brother Bird, 15 Small Pigs and 1 King Pig.It is found in the Big Setup.
How to receive
Go to the Big Setup Level 10-3. Destroy the duck between the two glass blocks. Use the Big Brother Bird to get it, since it's the only kind of birds you have.
Strategy
Aim at the 4 stone blocks on the left side, causing the TNT to explode.It should kill all the pigs.