A pigeon breeder selected individual birds to reproduce in order to produce a neck ruffle.
Similarly, nature unconsciously "selects" individuals better suited to surviving their local conditions.
Darwin and Wallace both realized that if an animal has some trait that helps it to withstand the elements or to breed more successfully, it may leave more offspring behind than others.
On average, the trait will become more common in the following generation, and the generation after that.
Individuals must compete, albeit unconsciously, for what little food there is.
In this struggle for existence, survival and reproduction do not come down to pure chance.
Charles Lyell and Joseph Dalton Hooker arranged for both Darwin's and Wallace's theories to be presented to a meeting of the Linnaean Society in 1858.
Darwin had been working on a major book on evolution and used that to develop On the Origins of Species, which was published in 1859.
Animals, Adaptation, and the Galpagos Islands Collect the Clues Make the Match Unlock the Mystery Interview With Paleontologist Dr.
A visit to the Galapagos Islands in 1835 helped Darwin formulate his ideas on natural selection.