Gerbils are sexually dimorphic. The males are larger and more robust that females. Males have a broader head. A typical showy male is 100 - 115 grams. Larger males may still be competitive if they are fit. Females are smaller. Their heads are not as wide. Showy females are about 65-80 grams. Larger and smaller females may also be competitive if they are no longer pup like and are not masculine.