It's D.W.'s birthday and all she wants is Mary Moo Cow (purple with pink spots--not pink with purple spots!) But when Mary Moo Cow gets sick to her stomachs (cows have four, you know), D.W. thinks her party is ruined. But Arthur saves the day when he arrives--disguised as Mary Moo Cow! Marc Brown is the bestselling author and illustrator of many award winning children's books including, Arthur, which spawned the hit animated television series on PBS. He was born in Eerie, Pennsylvania, but now lives in New York City and Martha's Vineyard, Massachusetts.