Adaptive radiation occurs when multiple variant species evolve over time from a single common ancestor. Perhaps the most well-known examples of this phenomena are the finches Darwin studied on his trip to the Galapagos, shortly before publishing his theories on natural selection. He hypothesized that as resources were no longer sufficient to support the growing population of finches on the islands, some species adapted to fill different niches. This explains the multitude of different beaks, each having evolved for the efficient consumption of a particular type of food. Modern humans are also an example of adaptive radiation. Other Hominid species preceded modern humans such as Homo Ergaster and Homo Habilis, and even these genus species arose following in the footsteps of the Australopithecus. Prior to that, there exists a common ancestor for all species of organisms in close relationship to humans, including the Neaderthalensis.