Dormouse/ˈdɔːrmaʊs/ Definition 1 of 1Pro Tip 1/3Animal Category Dormice belong to the group of animals called rodents, like mice and squirrels. At the zoo, the dormouse was in the rodent exhibit. Pro Tip 2/3Sleeping Habit Dormice are known for their long periods of sleep, even referenced in some cultures as sleepy. The character in the story was as sleepy as a dormouse. Pro Tip 3/3Not a House Mouse Although 'mouse' is part of its name, a dormouse is not the same as a typical house mouse. Unlike house mice, dormice have bushy tails and hibernate.