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Because siberian hamsters cannot be caged together, they are solitary animals, and even siblings, or mother and offspring, will fight once they are grown.

You need to separate them, they can fight to the death if they're kept together.

Yes, while some do good from a litter for a while, the fighting will just get worst

I agree. Hamsters must be kept apart. They will continue to fight until one is killed.

Thank you for your reply, the hamsters have now been separated.