What is the size variance per package? I need to order rats and am shooting for something (pups) in the 28-30 gram range. I ask because I currently use, and love, The Mouse Factory but they are out of pups and won't have any for a while. When TMF says the 'average' size is 19 grams for a fuzzy they really mean it...all are evenly sized and weigh between 19-21 grams. I used RodentPro before (and will never use them again) and they gave a large 'range' in weight and I found them to be on the light size, they list fuzzies as 9 - 19 grams and most were 8 grams, they were more like pinks frankly. I worry because I was thinking of using Big Cheese for this round but they list pups as 20-35 grams...that is a big range. If they are closer to 20 grams they will be too small and if they are 35 grams they are too big (and I could just use the weanlings I have now at that rate). Anyway, if someone could let me know what the size range really is for the size range stated on the website I would appreciate it! Thanks!