Adam Lyon is accidentally enrolled in the all-animal Charles Darwin Middle School, where the animal inhabitants of the local zoo send their kids, making him the only human student.
Jake spends his day off from school at school enjoying all the facilities without those annoying classes getting in the way, and he persuades Adam to join him.
Lupe falls in love with Orlando Parrot, a bird who tells her all the things she likes to hear. Sadly for Lupe, the only "Pretty Bird" Orlando fancies, is his own reflection in the mirror.
The carnival comes to school, and while Jake and his animal buddies enjoy everything it has to offer, Adam becomes totally obsessed with winning a cheesy Princess Ballerina Snow Globe.
Adam is given the keys to the lookout tower, a swanky bachelor pad high atop the school. He's supposed to keep watch. That's not easy when his friends decide to use his place to throw a massive party.
Adam finds that rather than letter grades, CDMS gives out generic symbols like smiley faces. At Adam's request, Principal Pixiefrog changes to traditional letter grades with some frightening results!
When Adam fails yet another feeding frenzy exam, Mr. Hornbill hints that he'll be held back if he doesn't pass the next test. A reluctant Bull Sharkowski is appointed as Adam's new tutor.
Windsor enrolls his ventriloquist's dummy, Teddy Truman, at CDMS, and no one but Adam seems to realize the annoying puppet isn't a real living creature.
When spring fashions get out of hand, Principal Pixiefrog institutes a school uniform policy. The new uniforms cause all the students, except Adam, to start acting overly proper.
Jake goes crazy when Adam stays home sick from school one day. Windsor, Slips and the gang construct an effigy of Adam to hold Jake over until the real Adam returns to school.