Ms. Frizzle's class is visiting the zoo, which is, according to Tim, the only place in the city where wild animals can survive. To test this idea, Ms. Frizzle turns the class into possums, foxes, and falcons! The Bus, with Liz inside, becomes a bear and wanders off, looking for food. The kids explore the city as animals and see how wildlife can live in the city, but they also need to find the Bus-bear. They must survive in the city as well. Will the kid-animals be able to find the Bus-bear before the zookeeper finds it? And is Tim right? Can animals (like themselves) survive in the city?moreless