Number of blue beetles in green bushes increase, only because the red beetles living there were trampled by a herd of elephants.
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It's called Genetic Drift, in which, for maintaining a population balance, a part of it has to become more prone to danger while the other gain advantage from it and survive.
It is also known as the Sewall Wright effect or the allelic drift.
It is the change in the frequency of an living gene variant within a population because of random sampling of a large number of organisms.
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