"When new species form rapidly, evolution of new species often re-uses old genes borrowed from previous species.
Dolph Schluter studies how new species form and become different from one another. His main study organism is the threespine stickleback, which is found in the ocean, but has also colonized freshwater lakes. In some lakes, two distinct forms have evolved. Find out how the flow of ancient genes influences the development of new species.
Animation by Derek Tan and Evan Craig. Videography by Derek Tan. Editing by Evan Craig."
Source: Researchers Revealed