Ok I am starting to breed rats now and I build the rack got everything set up and bought 8 females 2 males. Ok at the pet store the males had huge testies but when I put them all in the racks I cant really tell the males from the females. I know they retract them when they are scared. But looking at one I know is a male and one I know to be female I cant tell the difference and They really dont like to hold still and let you check there junk.
If any one could post pictures of a female compared to a male when he is scared and point out the diffrences to me that would be great.