White-furred rats may outnumber black-furred rats due to natural selection, as their fur color might offer better adaptation to the environment. Genetic drift could also contribute, leading to a higher number of white-furred offspring by chance. Additionally, a mating preference for white fur could further increase their prevalence in the population.

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White-furred rats may outnumber black-furred rats due to natural selection if their fur color provides better camouflage in their specific environment, helping them avoid predators. Genetic drift might also play a role, causing random fluctuations in allele frequencies that could lead to a higher number of white-furred offspring by chance. Furthermore, if there is a mating preference for white fur among rats, this could enhance their prevalence in the population, reinforcing the trend over generations. Together, these factors contribute to the observed dominance of white-furred rats in certain environments.