The episode "The Birdbot of Ice-Catraz" tackles the issues of pollution and its effect on wildlife. In a parody of the Exxon "Valdez" oil spill, a tanker spaceship (piloted by a sober Bender) spills its cargo of "dark matter oil" on a penguin colony on Pluto. The dark matter actually functioned as an aphrodisiac, or as the environmentalist puts it "a Penguin Spanish fly", so rather than killing the penguin population, the pollution vastly increases the speed and rate of their breeding, as even the males were producing eggs. This leads the conservationists, who originally set out to save the wildlife and clean up the oil spill, to resort to hunting the penguins to prevent them starving from overpopulation. The episode's stance on the issue of hunting was influenced by some of the writers on "The Simpsons", which has also presented multiple viewpoints on controversial issues.