A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change. About twice a year, one or two more birds from the neighboring island arrive. These new arrivals .

Drags back the adaptation process

Explanation: These new arrivals delays or holds back the adaptation process of the population. The newly arrived birds are still fresh in terms of traits and behaviors from their home island, they will take a long time to adapt to new behaviors as well as develop the predominant traits, there by taking the whole process of adaptation of the general population backward.

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