Owing to a school project, eight-year-old Aldo decides to give up eating meat.

While her class is studying reptiles, Katie, a vegetarian, refuses to feed worms to Slinky the snake, class 4A's pet, but when the magic wind turns her into Slinky, Katie learns that some animals cannot survive on vegetables alone.

Harry's decision to become a vegetarian causes some problems for him in his third-grade class.

As one of many Pudgies awaiting their trip to the meat factory from the Pudge Processing Farm, little Hubert escapes to the jungle where the animals show him all the good foods he can eat and, as a result, he becomes the first Pudge to achieve full size since ancient times.