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[[Image:Originb.jpg|right|thumb|The first edition of ''On the Origin of Species by Means of Natural Selection'' published in London on November 24, 1859.|250px]]

[[Image:Originb.jpg|right|thumb|The first edition of ''On the Origin of Species by Means of Natural Selection'' published in London on November 24, 1859.|250px]]

'''''On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life''''' is a book by [[Charles Darwin]] published in 1859. It introduced the world to [[evolution]] through a process of [[natural selection]]. The main thesis was that different animal species were not independently created, and that similar species can result from natural variation followed by different survivability rates. Animals that are more adapted to their environments are more likely to survive. Alfred Russel Wallace wrote a similar theory independently, and had sent a manuscript to Darwin. Darwin also used Herbert Spencer's phrase "survival of the fittest", but then fitness has to be defined as that which survives.

'''''On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life''''' is a book by [[Charles Darwin]] published in 1859. It introduced the world to [[evolution]] through a process of [[natural selection]]. The main thesis was that different animal species were not independently created, and that similar species can result from natural variation followed by different survivability rates. Animals that are more adapted to their environments are more likely to survive. Alfred Russel Wallace wrote a similar theory independently, and had sent a manuscript to Darwin. Darwin also used Herbert Spencer's phrase "survival of the fittest", but then fitness has to be defined as that which survives.