The mega ducklings are miniature versions of Mega Duck that can be unlocked by luring Mega Duck to South Feldip Hills (not killing him), where he will swim off with Mrs Duck. There is a 1 in 20 chance of obtaining this pet.
It is not required to hit Mega Duck to be eligible for the pet, it is simply enough to be near Mega Duck when it departs with Mrs Duck. Players unlock the pet individually, and not as a group. Unlocking it gives the message: Congratulations! You have unlocked the pet: Mega Ducklings.
During the Summer Beach Party, players who own the mega ducklings are able to unlock the title, [Name] the Totally Quackers.