It would be pointless, but there are many things going on in the anatomy and physiology of any species. I do discover something that is so hard to get that it is growing and growing in my interest. If you have seen many cartoons of some reptiles and mammals, you will see that their belly is lighter in fur coat or, the scales are more like ridges that you see on bellows. In real life, you will see the same thing on most animals. I ask, why are they this way? Well, I may have this answer after some study in university biology.
I have a few acceptable hypotheses:
From what I learned in physiology and genetics, places tend to get darker when exposed to the sun a lot more than usual. For four-legged creatures, they almost always have their backs toward the sun and whereby have defensive mechanisms to defend itself from skin damage- in the skin, there is keratin (in some species) and melanin to shield harmful UV rays away from the skin. The mammalian fur being made is done under the influence of this and is darker. The scales for the reptiles, some fish and amphibians would copy this behavior. The animal's integument (skin, nails, fur, scales) will cause its protection from the sun, wind and tempaerature- to put the body into homeostasis. Of course, the rare exception are those that want to trap hear in the belly area in such cold areas-an example 8s the cute red panda.
The belly is a different color in most cases because of the suns rays not reaching them. Terrestrial animals and birds are more prone to lie down on their bellies; in the case of birds, you will see the belly of the smaller ones profoundly because of a larger surface area by percentage since their legs are smaller and their belly is rounder than the larger ones.
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