For those who have slept through the last twenty-odd years: The Cirque du Soleil is a Canadian circus that uses no animal acts. Just human trapeze artists and high-wire acts and acrobats and clowns and . . . well, all the stuff you go to the circus to see.
Besides, a tightrope walker’s cage rarely needs cleaning.
This all sounded perfectly reasonable to the rats—except for the “no animals” part.