Japanese quail
Egg weight, color, shape, and size can vary greatly among different females of a Japanese quail population; however, these characteristics are quite specific and consistent for any given female. Eggs are generally mottled with a background color ranging from white to blue to pale brown. Depending on the strain of the Japanese quail, eggs can weigh anywhere from 8 to 13 grams, though the accepted average weight is 10 grams. Age seems to play a role in the size of eggs produced as older females tend to lay larger eggs.