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[[Charles Darwin]] wrote ''The Origin of Species'' {{years ago | 1859}} years ago, hoping to account for the diversity of plant and animal life with an entirely [[naturalistic]] explanation (see [[Theory of evolution]]).
[[Charles Darwin]] wrote ''The Origin of Species'' {{years ago | 1859}} years ago, hoping to account for the diversity of plant and animal life with an entirely [[naturalistic]] explanation (see [[Theory of evolution]]).
==Ring Species==
This is a phenomenon which occurs when a contiguous lineage ancestors co-exist at the same time. Unlike most species whose direct ancestral species are now extinct, the ancestral species of a ring species still survive. The existence of ring species make it more difficult to define what a species is. For example, A can breed with B can breed with C can breed with D... however D cannot breed with A. The most prominent example of a ring species is the Larus Gull which resides in the north Atlantic. Neighboring species interbreed counter-clockwise around the arctic, however this ability to interbreed terminates near Britain with the Herring Gull and Lesser Black-Backed Gull.<ref>Harrison, Peter (1988): Seabirds (2nd ed.). Christopher Helm, London ISBN 0-7470-1410-8</ref>
==Note==
==Note==