There are significant differences between pet mice and hamsters in many aspects. The following is a comparison between them in terms of family and genus, appearance, living habits, and feeding habits:

1. Differences in Family and Genus
Hamsters belong to the Cricetidae family, while mice belong to the Muridae family. Although they both belong to the Myomorpha suborder of the Rodentia order, they are classified into different families, so there are differences in biological classification.
2. Differences in Appearance
- Body Shape and Weight
Hamsters usually have a rounder body shape, while mice appear slender. The body length of a hamster is about 8-10 centimeters, while the body length of a mouse is about 12-30 centimeters.
- Tail
The tail of a mouse is relatively long, usually 10-20 centimeters, while the tail of a hamster is short and covered with fine fur, about 1-2 centimeters in length.
- Fur
The fur of hamsters is colorful, with different colors such as yellow, brown, black, and white, and there are also spots and patterns. The fur color of mice is relatively monotonous, usually gray or brown.
3. Differences in Living Habits
- Solitary or Social Living
Hamsters are usually solitary animals and are more suitable for being kept alone. Mice, on the other hand, are social animals and can live together with other mice.
- Activity Time
Hamsters are mainly active at night and rest during the day. Mice do not have an obvious pattern of activity time.
- Living Environment
Hamsters prefer a dry environment, while mice are more adapted to a humid environment.
- Temperament
Hamsters have a gentle temperament and are easy to get close to humans. Mice seem alert and cautious, and they are extremely wary of humans.
4. Differences in Feeding Habits
- Main Food
Both hamsters and mice are omnivorous animals, but their food choices are different. Hamsters like to eat pumpkin, cabbage, lettuce, tubers, beans, fruits, wild grasses, and seeds, etc. Mice like to eat grains, melon seeds, peanuts, and fried foods, etc.