I haven't weighed them lately, but they were just over a kg each in January at their last weigh in. I will get an accurate weight in a couple of weeks when they have passed the last couple of rats. I moved them to fortnightly feeds late last year, as they had grown so quickly and I didn't want them to get fat. They REALLY love their food. I have heard that the wild specimens will breed at about 500g, but then again, they may be a couple of years old at that point, as they are not getting regular rats like the captives. If not interested in each other or if the female doesn't ovulate, I won't be terribly disappointed. I just thought it worth a try. What breeding weight do you aim for with your WA females?