"Demonstrating Rapid Evolution Caused by Natural Selection in Response to Environmental Changes"
Through the long-term field study more than 35 years on Darwin's finches on the Galápagos Islands, the Grants demonstrated that morphology and behavior of organisms are altered rapidly by natural selection in response to recurrent environmental changes. Their work has not only made enormous contributions to evolutionary biology and ecology, but also has had a profound influence on the general public through demonstrating the evolution by natural selection in the field.