Betty G. Birney 
Imagination According to Humphrey 

Everyone's favourite hamster has another adventure in Room 26 and beyond!In this eleventh book in the bestselling 'According to Humphrey' series, Humphrey and his friends in Room 26 let their imaginations loose! Ahead of a big author visit to Longfellow Elementary School, they try writing their own stories, but Humphrey worries that hamsters don't have any imagination; he's finding creative writing just too hard. While he helps out his friends in Room 26, and the new school pet Gigi, a guinea pig, Humphrey encounters real, live parrots, dragons and even ghosts . . . and finally manages to let his imagination soar.