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''On The Origin of Species by Means of Natural Selection'' 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'' 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.

Human evolution is conspicuously absent from Origin - knowing of the opposition such a suggestion would face, Darwin confined his initial speculation to nonhuman animals.

Human evolution is conspicuously absent from Origin - knowing of the opposition such a suggestion would face, Darwin confined his initial speculation to nonhuman animals. He devoted another, but less famous book to the evolution of man.

==Summary==

==Summary==