Rhyming text describes the preparations made for a boy's birthday party by his hosts, the animals at the zoo.

Orville is a little penguin who lives in a zoo and dreams of big adventures, like going to the Moon; the other animals are skeptical, but Orville is determined, so he builds a spaceship and sets out all by himself--and discovers that real adventures are best when they are shared with friends.

Because his loud snores disturb all the other animals at the zoo, Bernard the otter tries to find a solution.

Fiona the Hippo and her friends at the zoo come together to help Mango, a little blue penguin who is stuck on a ledge.