Cute water-color illustrations help tell this rhyming story of a four-year-old who becomes friends with all the animals in the zoo.  Disturbed by their confinement behind bars, she decides to set them all free one night and invite them to live at her house.  Of course this arrangement creates problems too, but her bold initiative spurs the zookeeper into upgrading their home.  One problem for American readers:  because it was originally published in Great Britain, the rhyme is thrown off a bit for our pronunciation at times (door-saw?).