Girl or Boy

Question
Hello, Sara
I needed to know if my hampters are a girl                                                                                                                                                                                                                                                                            or boy can you help me please?

Answer
Hello, determining the sex is not too difficult.  In a male the distance between the anus and the sexual opening is noticebly larger than in the female.  And in sexually mature males(about 4th or 5th week on) the testicles on either side of the anus are clearly visible.  
If you have any more questions feel free to ask!
     Hope this helps,
          Sara