Migration Annihilator is a mission for the Big Daddy (Dunkleosteus). You must, using the Big Daddy, eat 10 rare birds in one game. The reward is over 4,000 coins. This mission is probably moderately hard because the rare tropical birds can be difficult to find sometimes.
It is highly recommended you use a jetpack because if you don't, you would have to rely on the fans and perfect jumps.