The species of Gemmas bird changes due to a phenomenon known as “character displacement.” This occurs when two closely related species live in the same area and evolve to become more different from each other in order to reduce competition for resources. In the case of the Gemmas bird, the two species have evolved to have different beak shapes and sizes, which allows them to eat different types of food and avoid competing with each other.
Character displacement is an important evolutionary process that helps to maintain biodiversity. By allowing two closely related species to coexist in the same area, it helps to ensure that both species have access to the resources they need to survive.