A UC Riverside scientist has made a key discovery about evolution from an unlikely source: guppies.
UCR professor of biology David Reznick used the small fish to study this question: do animals evolve in response to the risk of being eaten, or to the environment that they create in the absence of predators?
According to Reznick’s research, it’s the latter.
In the wild, guppies can migrate to places where predators can’t follow them. Once they arrive in these places free of predators, they start to evolve rapidly.