Like many of life's problems, the Simpsons presented the best solution:

Skinner: Well, I was wrong. The lizards are a godsend. They've killed all the pigeons.

Lisa: But isn't that a bit short-sighted? What happens when we're
overrun by lizards?

Skinner: No problem. We simply release wave after wave of Chinese
needle snakes. They'll wipe out the lizards.

Lisa: But aren't the snakes even worse?

Skinner: Yes, but we're prepared for that. We've lined up a fabulous
type of gorilla that thrives on snake meat.

Lisa: But then we're stuck with gorillas!

Skinner: No, that's the beautiful part. When wintertime rolls around,
the gorillas simply freeze to death.