

In The Rescuers Down Under, Marahute the mother eagle's feather color is a softer golden brown than the feather belonging to the fallen father (possibly justified, since the male had been dead for quite a while, and the feathers might have become dirtier).

The human equivalent is Light Girl, Dark Boy. Bicolor Cows, Solid Color Bulls is a subtrope involving cattle. Often overlaps with Messy Male, Fancy Female. Obviously a case of Color-Coded for Your Convenience and Secondary Sexual Characteristics, serving an identification function similar to Tertiary Sexual Characteristics. To invert this, some will go further in the opposite direction than played-straight examples go in the original, such as giving a pale guy a dark-skinned girlfriend, etc.
DARKSKINNED ARTOON GIRLS SKIN
Also, in a lot of anime and manga, the skin color difference between the sexes will be exaggerated. Often the way to discern gender in ancient paintings was by the skin tone. This trope is Older Than Dirt going way, way back in art history. Some species invert this, notably raptors, where the females are larger, darker, and have more ostentatious markings. Males tend to have darker, flashier colors, while females are more drab-peacocks are an especially dramatic example. This is also true of many other species, especially avians.
