[Tammy22]

Hiya Paul,

First of all, you should never keep a male and female together if you are not intending them to breed, as this is what will happen eventually - but you should especially not let a brother and sister live together as it is not a good idea to let them mate with each other!

Even species who can be social and sometimes live together in the wild can prefer to live alone sometimes, and when you have more than one hamster living in the same cage you should always keep a very close eye on them for any signs of squabbling or fighting. This can happen very suddenly as you have found out, but once they have drawn blood then they should be split up and are usually better left living alone.

Hope this has helped,

Tammy x