A.J. and his fellow third-graders from Ella Mentry School, including new student Alexia, go on a field trip to the zoo, where they meet a very strange zookeeper.

Noah and his friends follow a trail of mysterious clues to uncover a secret behind the walls of the Clarksville City Zoo--a secret that must be protected at all costs.

"Nancy, George, and Bess are attending a three-day overnight camp at the local zoo. They'll get to spend lots of time with all of the animals and learn about them, too. The best part is, they will be helping the zookeeper make toys for the animals, just like real staffers! But when the toys the girls make by day are disappearing at night, it looks like everyone is a suspect! Can Nancy tame this wild case, or will the zoo animals be without anything...

Bored with her life, popular high school junior Libby signs up for an internship at the zoo and discovers that the "science nerds" she meets there may have a few things to teach her about friendship and life.

"In her bedroom wall, Sylvie spots a door, and beyond that door she finds a passage, and beyond the passage she discovers the Zoo! Where Sylvie finds lots of animals, looking at her! So she decides to bring a few small ones, like a little bear, into her bedroom at night time, just for a cuddle. And then she takes the penguins back for a splashy bath. Once, she even brings back the monkeys but, really, they were too messy. No matter what Sylvie does...

Twelve-year-old Lexington, a foundling raised in a zoo, spends a summer cementing friendships, growing closer to the elephant that saved her life, and learning about her family and herself.

Anxious to see what life is like outside the zoo, Sammy the seal explores the city, goes to school, and plays with the children but decides that there really is no place like home.

Milo, a snow monkey who is fascinated by Central Park's Delacorte Clock, finally gets his chance to join the dancing animals there but then discovers he cannot return to his friends in the zoo.

Twelve-year-old Teddy investigates when a popular Texas zoo's star attraction--Henry the hippopotamus--is murdered.

Desmond and Andres face a zombie during a school field trip to the zoo.