When we got Kodak (our male) he was considerably smaller than Nikon. There was approx 10g difference between them, they were approx 4mos old and Nikon weighed approx 60g while Kodak weighed approx 50g. Now Kodak is bigger than Nikon, hes 73g shes 68g. Could it just be shes getting ready to have another growth spurt or is it that males are bigger than females. They both have identical SEPERATE enclosures eating the same food.