If you had more pale snakes than dark snakes why aren't the dark snakes wiped out by natural seletion?

1.  Have you got natural predators... like meercat?
2.  Are they in the wild?  Or,
3.  Cosily caged?
4.  Natural selection?  Or force bred?
5.  Snakes do not perceive color, only body heat.
6.  No snake has ever been made out to be racist.
7.  In laboratory conditions I can breed, black and white spotted, like fox terriers.
8.  Rethink and re post.
Peace.

In some cases the dark snakes have indeed been "wiped out" by natural selection. There are populations that do not have any dark colored snakes. If there is polymorphism in a population, and some are dark and some are lighter colored, it may be because the habitat is not identical over the entire area.  Some parts of it, for example, may have a dark background, such as volcanic rock, that favors dark colored snakes, and other parts may lack such backgrounds, and are therefore better suited for light colored snakes.  Further, if the snakes are primarily nocturnal, then they can be any color and it won't make any difference, because few predators can see the snakes anyway.