Start with high-confidence zoo stories books, then narrow by subgenre or adjacent topics.
The Secret Zoo
Bryan Chick
The Secret Zoo: Secrets and Shadows
The Secret Zoo: Traps and Specters
The Secret Zoo: Raids and Rescues
The Secret Zoo: the Final Fight
At the Zoo (bright Baby Touch and Feel)
Roger Priddy
Dear Zoo
Rod Campbell
How to Hug an Elephant #6
Henry Winkler, Lin Oliver
Ten Playful Penguins
Emily Ford
Little Polar Bear Finds a Friend
Hans de Beer
Don't Feed the Boy
Irene Latham
A Snow Day for Amos Mcgee
Philip C. Stead
Polar Bear, Polar Bear, What Do You Hear? / Oso Polar, Oso Polar, ¿qué Es Ese Ruido?
Bill Martin, Jr.
