Thanks for the question...I guess I was in shock...
There was only 4 (now 3 females) from the last litter that hatched...They are probably around 2 months old...All were healthy and she was my lone blue dumbo that I was hoping to hold back...The rest were dark gray dumbos...I hope this might shed some light on what might have happened...Could it be rat racially motivated? LOL sorry, had to find some humor in it...