Mutation that results in any butd group being better suited to its environment will increase their population, while any mutation that makes a bird group less suited for its environment will decrease their population.
What is mutation?
Mutation refers to the changes that occurs in the sequence of nucleotides in DNA molecules.
Mutations can make an organism more suited for its environment in some cases.
However, mutations usually have deleterious effect on the organism affected.
In the case of the birds, mutation would increase the population of any bird group if it resulted in the bird being able to breed better, avoid predators, and catch prey more easily.
However, any bird group in which mutation reduces it fertility rate, increases it susceptibility to diseases and prey will decrease in population.
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