Millie, a pig, knows ""everything there was to know about mud."" She loves it. Despite the increasingly urgent (and amusingly rhymed) warnings of her farmyard friends, she goes on sitting in a mudhole, pretending to be a lily pad or perhaps a cherry in a chocolate milk shake. At last, she sinks too deep to extricate herself and has to be rescued by all nine other animals pulling in a row with the pig keeper. Finally, like Russian folklore's turnip, she pops out, still fantasizing and unperturbed. The story, as silly as Millie herself, should amuse newly independent readers--who will also find that the simple language and the cumulative repetitions make reading a breeze. Wickstrom's lively action, broadly comical animal characters, and sunny colors add substantially to the attractions.