When a box of cell phones is accidentally delivered to the zoo, one blue gnu quickly calls two white sheep, who plan a party - beep beep beep! This illustrated picture book will keep young readers giggling and guessing to the end. News of the party spreads to three orange apes, four red pandas and five green ducks... up until ten purple birds learn it's party time! But oh no - who invited tiger, and who will he call on his new phone? ONE BLUE GNU is a fun and colorful romp at the zoo, where we count from one to ten and down again in one huge party!