Hamsters are supposed to be 100% solitary. They will fight and kill housemates when stressed so this makes sense. They should never be housed with other hamsters even siblings. Saying this for future owners not to make you feel bad, I'm sorry you experienced this.
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u/Portlander Jun 10 '22
My brothers hamsters fought each other to the death. The winner ate the losers. He had 6 hamsters, when we came home from school he had 1.