There's a Rabbit in My Backpack — Susan Clymer

Tom's third grade class has a pet hamster named Squeaks and a tarantula named Hairy. Hopscotch arrives, but the rabbit can't stay forever. Can the students of Room 202 find the rabbit a new home in time? At home, Tom collects racecars and studies ballet. Tom's mother has recently remarried. Life has never been easy for a guy with two teenage sisters, but now he has little brothers, the terrible twosome! *****

Susan Clymer has eleven books published by Scholastic, including three other mysteries in the Animals in Room 202 Quartet: There's a Hamster in My Lunchbox; There's a Tarantula in My Homework; and There's a Frog in My Sleeping Bag. There's a Rabbit in My Backpack is a story about adapting to change for the seven to ten year old reader.