Margaret Mahy's classic story about a boy who brings home a hippopotamus quite by accident, illustrated by Steven Kellogg. 'What on earth is that in the goldfish pool?' asked Robert's father. 'It is a hippopotamus, Father,' said Robert. 'Really,' said the father. 'People should keep their hippos chained up and not allow them to go climbing into other people's goldfish pools.' When a hippo follows him home one day, Robert is pleased - but his parents are not! As more and more hippos crowd into the garden they turn to a witch for help. Detailed line and pastel drawings by Steven Kellogg, and a deliciously understated text, combine in a very funny picture book by one of New Zealand's finest children's writers.