Hamsters are social animals and are usually very friendly and social. However, in some cases, hamsters may engage in cannibalistic behavior. Here are some reasons that may cause hamsters to kill each other:

1. Territory competition: Hamsters are territorial animals, and territoriality may occur when they are forced to live together in a small space. scramble. This can lead to mutual aggression and injury.

2. Male competition: If multiple male hamsters are placed in the same cage, they may fight and attack in order to compete for mate rights.

3. Fighting between females: Female hamsters may fight over resources, baby care, or territory.

4. Stress and maladaptation: Changes and maladaptation of hamsters to the environment may cause stress reactions, leading to aggressive behavior among them.

5. Mother hamster attacks her pups: Sometimes, mother hamsters may act aggressively toward their pups. This may be due to stress or a feeling that something is wrong with your pup.

In order to avoid cannibalism among hamsters, ensure that sufficient space and resources are provided to reduce competition and stress. Additionally, make sure your hamster is kept in an environment that meets their needs, including providing adequate hiding places and appropriate social interaction. If aggression occurs between hamsters, consider separating them to prevent further damage. If the problem persists, it's best to consult a veterinarian or husbandry expert for help.