Speciation
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Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as oppo
African pygmy kingfisher, showing coloration shared by all adults of that species to a high degree of fidelity.
Cichlids such as Haplochromis nyererei diversified by sympatric speciation in the Rift Valley lakes.
Rhagoletis pomonella, the hawthorn fly, appears to be in the process of sympatric speciation.
Gaur (Indian bison) can interbreed with domestic cattle.
Reinforcement (speciation)
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Reinforcement is a process of speciation where natural selection increases the reproductive isolation between two populations of species. This occurs as a result of selection acting against the produc
Alfred Russel Wallace proposed in 1889 that isolation could be strengthened by a form of selection.
Darwin's finches by Gould