Using a trap they discover an unusual creature that resembles a humanoid duck which turns out to be extremely annoying to everyone in town with the exception of Cartman, who is enchanted by its antics.
The town has a meeting to decide what is to be done about the creature when representatives from the Department of Interior (DOI) show up and inform the townspeople that it is a near-extinct "Jakovasaur", which they intend to use to repopulate the species.
Fed up with the Jakovasaurs, the townspeople convince them to move to Memphis where they'll fit in as all the people there are "big, loud, annoying, and stupid".
Cartman is too late and he arrives at the airport just as the plane carrying Jakov and his family taxis down the runway and lifts off.
The episode ends showing the Jakovasaurs on tour in Paris, looking for the Pyramids, when Jakov trips and crashes into a cafe full of French people.
The episode was produced just weeks before the release of South Park: Bigger, Longer & Uncut, and its production ran concurrently with the movie's post-production, a process which the show's creators described as "hell".
[1] The episode aired on June 16, 1999, the same day that Trey Parker was putting the finishing touches to the movie's sound mix.