Daisy and the Trouble with Zoos (Daisy series)

Mom has invited Daisy’s best friends, Gabby and Dylan, on a trip to the zoo—and, best of all, Mom has arranged for Daisy to go into the actual penguin cage with the actual zoo keeper and feed actual penguins—real penguins, with beaks and everything! Trouble is, Daisy doesn't just feed the penguins, she "adopts" one to take home and everything.