An unobservant zookeeper is followed home by all the animals he thinks he has left behind in the zoo.

When his sister disappears, Noah, along with their best friends, Ella and Richie, sneak into the neighborhood zoo and delve into the unknown world of the animals, where they discover a great secret that the zoo is protecting.

When a gorilla who knows sign language tells his keepers that he is lonely, they bring him a very special friend.

"Pinkalicious can't wait to see all of the animals at the zoo. She doesn't count on getting into some monkey business of her own!"--P [4] of cover.

"On Halloween night, the scouts, along with their Descender allies, must battle terrifying sasquatches at their own elementary school. Little do they know, the sasquatches are merely the bait to a trap. DeGraff captures three of the Descenders and drags them into a frightening, off-limits sector of The Secret Zoo. Meanwhile, Noah and his friends must protect two of their animals allies from police officers who are convinced that they are dangerous...

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

Nancy Drew investigates when a pony from the petting zoo keeps escaping from his pen.

While on a school field trip to the zoo, Harry accidentally allows the monkeys to escape their habitat, and he thinks he can fix the mess using one of his superhero inventions.

"Someone is trying to hunt FunJungle's Asian greater one-horned rhinoceros, and twelve-year-old Teddy Fitzroy is on the case"--

Having discovered a magical society beneath the exhibits at the Clarksville City Zoo where animals and humans live harmoniously together as equals, Noah and his friends must protect the secret zoo at all costs.