Answer:
Traits, like fur colour, can be selectively advantageous for organisms belonging to a certain species.
Fur colours often allow organisms to better hide from their predators
For example, consider a brown fur coloured squirrel and a white fur coloured squirrel. The brown coloured squirrel will be better adapted to hide from its predators as its colour can camouflage with the colour of the woods. The white colour squirrel will not have such a selective advantage and will have more chances to be eaten up by its predator.