Daphne Major is a volcanic island just north of Santa Cruz Island and just west of the Baltra Airport in the Archipelago of Colón, commonly known as the Galápagos Islands. It consists of a tuff crater, devoid of trees, whose rim rises 120 m (394 ft) above the sea.
Though easily accessible to most visitors to the Galápagos, the national park service has highly restricted visits to this island, and it is primarily used for scientific research. An intensive study of Darwin's finches was conducted here by biologists Peter and Rosemary Grant over a period of 20 years. They examined the behaviour and life cycles of finches, with the results strongly supporting Darwin's theory of evolution. Their efforts were documented in the Pulitzer Prize–winning book The Beak of the Finch.
- B. Rosemary Grant and Peter R. Grant. 1989. Evolutionary dynamics of a natural population: the large cactus finch of the Galápagos. Chicago
- Peter R. Grant. 1999. Ecology and evolution of Darwin's finches. Princeton NJ.
- Peter R. Grant and B. Rosemary Grant. 1992. Demography and the genetically effective sizes of two populations of Darwin's finches. Ecology 73(3): 766–784.
- Jonathan Weiner. 1994. The Beak of the Finch: A Story of Evolution in Our Time. New York: Alfred A. Knopf, Inc. ISBN 0-679-40003-6.
- Drought and the Demography of Darwin's Medium Ground Finches on Isla Daphne Island, Wendy E. Sera, Baylor University. Accessed 2007-04-21.
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