The reasons why a hamster eats another's head are as follows:

1. Hamsters have a strong sense of territory and may fight. In more serious cases, one hamster will eat another's head. The phenomenon of just eating.

2. The breeder does not provide enough food, and a hamster facing a survival crisis will eat another's head.

3. The temper of female hamsters will become more violent after pregnancy, and they will easily fight and bite each other until they kill each other.

4. If the hamsters kept in the same cage are sick or weak, they will be bullied by other residents.

Expansion:

Hamsters are solitary animals. They can only be mixed when they are in heat and need to mate, but they must be isolated immediately after the mating is completed. Otherwise, you will have a bad temper and attack the other person.