Waterfall Sr.: If the birds keep multiplying there'll soon be too many to count. Before long the penguins will exhaust their food supply and starve to death.
Leela: Oh, if only we hadn't flown penguins to Pluto and dumped oil on them, this might never have happened. Can't we stop them from multiplying?
Waterfall Sr.: Yes, I reckon it is our responsibility. And thankfully we have a plan.
Leela: What is it? We'll do anything.
Waterfall Sr.: Everyone, grab your guns. I declare penguin hunting season officially open.