Who are the main characters in 'the mixed up zoo animal story'?

The main characters might be a variety of zoo animals such as the sleepy sloth, the energetic monkey, and the majestic lion. And not just the animals, but also the people who work at the zoo, like the head zookeeper who has to deal with the chaos when the animals are all mixed up. There could also be a little child visitor who first notices the strange behavior of the animals due to the mix - up and becomes a key part of the story as they try to tell the adults what's wrong.

It's probable that the main characters are the zoo animals, and also the zookeepers. The zookeepers would play an important role because they are the ones who would notice the mix - up among the animals. For example, if a giraffe is acting like an elephant, the zookeeper would be the one to figure out that something is wrong. So both the animals and the zookeepers are likely main characters in this story.