The Baby-Sitters Club Wiki
The Baby-Sitters Club Wiki

Mary Anne and the Zoo Mystery is the twentieth book in The Baby-Sitters Club Mystery series.

Back Cover Summary[]

School at the zoo? Totally wild! The Baby-sitters can't wait to start on their animal observation projects for science class because they get to work at the Bedford Zoo!

But on their very first visit, Mary Anne and her friends smell trouble. Somebody's letting animals out of their cages.

So far, each one has been caught and returned without incident. But what if this monkey business turns serious? Can the Baby-sitters figure out who's behind it all, before somebody gets hurt?


Main Plot[]


The BSC forms a community service project with their clients to free Babar, an elephant.

Characters in this book[]

Mary Anne's Family

BSC Members




Places in this book[]

Pop Culture and Real-Life References[]

  • Black Stallion, Black Beauty (books)
  • Frankenstein monster

Continuity and Inconsistencies[]



  • On page 39 that she schedules a sitting job for Kristy and Jessi at the Pikes on Thursday, but then when they write about the Thursday sitting job a few chapters later, it's Kristy and Mallory sitting.


  • This books working tile was Mary Anne and the Mystery at the Zoo[1].
  • Logan is a natural at science.
  • Alan loves seals.
  • Mary Anne, Logan, Dawn, Claudia, Howie, and Alan have lifetime passes to the Bedford Zoo.
  • Stacey baby-sits Charlotte still even though she's not part of the BSC.
  • Kristy is dating Bart according to Mary Anne.
  • The Gianellis, Papadakises, Hobarts, and Pikes all call the BSC in chapter 4.
  • There's a YMCA in Stoneybrook.
  • One set of Mallory's grandparents is mentioned to have given the kids a button maker.
  • Mary Anne likes science even though she's not good at it.
  • On page 70 Peaches Benedict is indirectly mentioned.
  • Marilyn Arnold lost a tooth.
Mystery Books
#1 Stacey and the Missing Ring | #2 Beware, Dawn! | #3 Mallory and the Ghost Cat | #4 Kristy and the Missing Child | #5 Mary Anne and the Secret in the Attic | #6 The Mystery at Claudia's House | #7 Dawn and the Disappearing Dogs | #8 Jessi and the Jewel Thieves | #9 Kristy and the Haunted Mansion | #10 Stacey and the Mystery Money | #11 Claudia and the Mystery at the Museum | #12 Dawn and the Surfer Ghost | #13 Mary Anne and the Library Mystery | #14 Stacey and the Mystery at the Mall | #15 Kristy and the Vampires | #16 Claudia and the Clue in the Photograph | #17 Dawn and the Halloween Mystery | #18 Stacey and the Mystery at the Empty House | #19 Kristy and the Missing Fortune | #20 Mary Anne and the Zoo Mystery | #21 Claudia and the Recipe for Danger | #22 Stacey and the Haunted Masquerade | #23 Abby and the Secret Society | #24 Mary Anne and the Silent Witness | #25 Kristy and the Middle School Vandal | #26 Dawn Schafer, Undercover Baby-sitter | #27 Claudia and the Lighthouse Ghost | #28 Abby and the Mystery Baby | #29 Stacey and the Fashion Victim | #30 Kristy and the Mystery Train | #31 Mary Anne and the Music Box Secret | #32 Claudia and the Mystery in the Painting | #33 Stacey and the Stolen Hearts | #34 Mary Anne and the Haunted Bookstore | #35 Abby and the Notorious Neighbor | #36 Kristy and the Cat Burglar
Super Mysteries
#1 Baby-sitters' Haunted House | #2 Baby-sitters Beware | #3 Baby-sitters' Fright Night | #4 Baby-sitters' Christmas Chiller
Other Series
Baby-Sitters Club | Super Special | Portrait Collection | Readers' Request | Baby-sitters Club: Friends Forever | California Diaries | Baby-Sitters Little Sister | The Kids in Ms. Colman's Class