My friend had hamsters who kept having babies......they started out with 2 who were "suposed" to be the same sex and by the end of 4 weeks they had around 40 hamsters ! Finally they got rid of all but 2 who were once again suposed to be mother daughter......they had babies and when those babies were 4 weeks old, they had more babies and so on.....I'm not sure how many they have now if any their mom can't say no to any of the 4 kids.....the dad warned her what would happen, but she wouldn't listen so he wasn't a part of it. I just had to share that story with you guys!