A researcher finds that males in two populations of bowerbirds make different types of structures to attract female birds. The males of population 1 build hut- shaped structures and decorate them with colorful objects. The males of population 2 loosely interweave sticks around a central pole and decorate it with dull-
colored objects. Female bowerbirds prefer structures made by males of their own population.
What may likely happen if female birds continue their preference for structures built by males of their own population?