This is not actually from the Animal Ark Hauntings series, but Animal Ark. The title is Hamster in the Holly.
Heather K. (oldfashionedbookworm) reviewed Hamster in the Holly (Animal Ark #35) on + 22 more book reviews
RL4, ages 8-11
Just in time for the holidays, Animal Ark delivers another tale of animal adventure. Fun Christmas reading and a perfect stocking stuffer.