I have been a breeder for ten years and have never come across this so I am very confused. I bred two standard rats to each other and I ended up with 4 rex coated and 1 standard coat. The crazy part is rex id dominant and there is no way to get a rex baby if both parents are standards because since is dominant in order for the babies to get it the parents MUST show the gene. I am very confused. I only have the one buck so there is no way she could have bred with another male and they are the only two in the cage. The four babies have the curly whisker's and a wavy coat...did I discover something new? I am very confused and have never seen this in 10 years.