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→Ring Species: Demote paragraph, fix grammar, removed "counter-clockwise" (it must be bi-directional)
"Species" is sometimes defined in such a way that groups of creatures that do not ''naturally'' interbreed (perhaps because of geological isolation) are classified as separate species despite the fact that they ''can'' interbreed.<ref name="spark"/>
"Species" is sometimes defined in such a way that groups of creatures that do not ''naturally'' interbreed (perhaps because of geological isolation) are classified as separate species despite the fact that they ''can'' interbreed.<ref name="spark"/>
==Ring Species==
=== Ring Species ===
"Ring species" occur 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>
"Ring species" occur when a contiguous lineage of 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 makes 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 around the arctic interbreed, 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>
=== Classifying extinct creatures ===
=== Classifying extinct creatures ===