In a population of mice , individuals with medium brown fur are less likely to be seen by predators than light brown and dark brown mice.

This is because medium brown fur mice are better camouflaged in their natural environment, making them less visible to predators. Therefore, they have a higher chance of survival and are more likely to pass on their genes to the next generation. Over time, this could result in an increase in the proportion of medium brown fur mice in the population.