The Secret Zoo is by Brian Chick. The book has 320 pages. It is the first book in a series of five books.
If I Ran the Zoo has 39 pages.
there are 61 pages
The Secret People has 256 pages.
The Secret Warning has 192 pages.
The Secret of the Nagas has 398 pages.
Deep Secret has 375 pages.
The Secret Pilgrim has 335 pages.
Secret of the Sirens has 401 pages.
The Secret of Sinharat has 95 pages.
Secret Windows has 433 pages.
The Manticore's Secret has 536 pages.
The Secret Panel has 192 pages.