I am wondering, how much do 8 week normally weigh. My muscovies are going to be 8 weeks old in a few days and they seem to gain a lot of weight pretty fast and starting to grow like a weed. A few days ago, they both weigh 4 lbs each. Now my white one weighs 4.6 lbs and my dark one weigh 4.2 lbs. Is this normal? How much does yours guys muscovies weigh around 8 weeks old?