survival of the fittest: Quick Facts
Photos
Related Topics and References
Topics
Darwinian fitnessadaptationnatural selectionsexual selectiongroup selectionDeviously Darwinian: 6 Strange Evolutionary PhenomenaToday in History—September 15: Charles Darwin Visits the Galapagos IslandsWhy do giraffes have long necks?
Key People
Herbert Spencer
British philosopher
Alfred Russel Wallace
British naturalist