* Warm-blooded: Hamsters maintain a constant internal body temperature, regardless of the external environment.
* Hair or fur: Hamsters have a thick coat of fur for insulation.
* Give birth to live young: They do not lay eggs.
* Mammary glands: Female hamsters have mammary glands that produce milk to nourish their offspring.
* Three middle ear bones: These bones are crucial for hearing.
* Four-chambered heart: This allows for efficient blood circulation.
* Diaphragm: A muscle that separates the chest cavity from the abdominal cavity and helps with breathing.
These features collectively distinguish hamsters as mammals, placing them within the class Mammalia.