Mountain eggs: Mountain eggs usually refer to the eggs of wild birds such as pheasants and ducks. These birds live in the natural environment and eat freely, so their eggs are considered to be more natural. The shell color of mountain eggs may vary with bird species.

Grass eggs: Grass eggs refer to poultry and chickens kept in the natural environment. They can eat grass, insects and other natural foods in the wild. Grass eggs are considered to be more natural and healthy than industrialized eggs.

Earth eggs: Earth eggs usually refer to eggs laid by chickens raised in traditional rural areas. These chickens are not industrialized, but raised in rural environment and feed on natural food. Earth eggs may be different in eggshell color and yolk color.