European Hamster (Cricetus cricetus)
According to the search results, the largest hamster breed is the European Hamster (also known as the common hamster or Cricetus cricetus). Its body size and lifespan far exceed those of other hamster species. The specific characteristics are as follows:
Body Size and Weight
The body length can reach 20-34 centimeters, and it weighs about 900 grams. It is the largest species in the subfamily Cricetinae.
For comparison, a common pet hamster like the Syrian hamster (a relatively large pet breed among hamsters) has a body length of only 15-18 centimeters.
Lifespan
The average lifespan is as long as 8 years, which is much higher than the 2-3 years lifespan of common hamsters.
Distribution and Conservation Status
It was originally distributed in Eurasia. Now, due to the destruction of its habitat, it has become an endangered species. Countries such as France have invested funds in its protection.
Habits
Extremely Wild: It cannot be domesticated into a pet. Its aggressiveness far exceeds that of domestic hamsters, and it has strong fighting ability.
Appearance Features: With a black belly, it looks like it is "wearing a suit" when it stands up. It has grayish-white fur and dark red eyes.
Although other large hamster breeds (such as the greater long-tailed hamster) are mentioned as "the largest hamster in northern China", their actual body size and recorded data are inferior to those of the European Hamster.