Candlewick, Cambridge, Mass., 2007, 1^st paperback ed.  ISBN 978-0-7636-3413-1.  Trade soft cover, 166 pages.  Unread copy; touch of edge and cover wear.  ‘Libby Brin has the hippest friends, the hottest boyfriend, the trendiest clothes, and the most easygoing parents.  She’s the most popular girl in school, and she’s never been more bored.  Then she signs up for an internship at the Los Angeles Zoo, where she teams up with Tina (aka “Tiny”), a Little Person and aspiring actress, and Sheldon, an introverted boy with a brilliant mind.  Libby’s friends think the zoo is for losers, but Libby begins to realize that she may actually enjoy working there and even like Tina and Sheldon.  Will the Queen of Cool have to give up her crown? (from rear wrap)