Humphrey the hamster is puzzled when unfamiliar students fill Mrs. Brisbane's classroom at summer's end, but he soon learns that his friends from last year are fine and that the new class needs his special help.

After the holidays, Humphrey is shocked by a big surprise in Room 26-a new class pet! Humphrey tries to be welcoming, but Og the frog doesn't respond to any of his friendly squeaks or visits (remember, he has a lock-that-doesn't-lock). Plus, the students are so interested in Og, they almost stop paying attention to Humphrey altogether. Humphrey doesn't like the mad-bad-sad feelings he's had since Og came, but luckily he still gets to have adventures...

You can learn a lot about life by observing another species. That's what Humphrey was told when he was first brought to Room 26. And boy, is it true! In addition to having FUN-FUN-FUN in class, each weekend this amazing hamster gets to sleep over with a different student, like Lower-Your-Voice-A.J. and Speak-Up-Sayeh. Soon Humphrey learns to read, write, and even shoot rubber bands (only in self-defense, of course). With lots of friends to help, adventures...

"When summer arrives, Humphrey, the pet hamster of Longfellow School's Room 26, is surprised and pleased to learn that he will be going to Camp Happy Hollow." --

Humphrey, the pet hamster of Classroom 26, is helping Richie with a science project, but Richie's feisty puppy gets in the way.

"When Mandy, one of the students from classroom 26, brings a special hamster-sized racecar to class, it means just one thing--Humphrey is going to be in a hamster race"--

"Humphrey, the pet hamster of Longfellow School's Room 26, learns that his classroom is full of secrets, the most important of which is that a student will be leaving soon." --

It's almost Halloween, but the scariest thing in Room 26 has nothing to do with creepy decorations or spooky noises: Mrs. Brisbane is missing! This might be the biggest mystery Humphrey has ever tried to solve. Humphrey the hamster and the students in Mrs. Brisbane's class get ready for the holidays and a special Winter Wonderland program. "During a creative writing unit at Longfellow School, the students in Mrs. Brisbane's class practice using...

"The students of Room 26 are so excited for Longfellow School's big school fair! Pet hamster Humphrey is too--but will he be allowed to march in the parade with his classmates?"--