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"Where we have sexual reproduction a species can be objectively defined as a group of organisms which reproduce sexually amongst themselves but don't reproduce with members of other species.
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www.blackwellpublishing.com/ridley/a-z/Biological_speci...
www.blackwellpublishing.com/ridley/a-z/Biological_species_concept_b.asp
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The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance. Although appearance is helpful in identifying species, it does not define species.
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evolution.berkeley.edu/evosite/evo101/VA1BioSpeciesConc...
evolution.berkeley.edu/evosite/evo101/VA1BioSpeciesConcept.shtml
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The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance. Although appearance is helpful in identifying species, it does not define species.
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evolution.berkeley.edu/evolibrary/article/side_o_0/bios...
evolution.berkeley.edu/evolibrary/article/side_o_0/biospecies_01
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Species - Wikipedia, the free encyclopedia
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In biology, a species is: • a taxonomic rank (the basic rank of biological classification) or • a unit at that rank (in which case the plural is "species". This is sometimes abbreviated: "spec." o...
en.wikipedia.org/wiki/Species
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Ernst W. Mayr - Wikipedia, the free encyclopedia
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Ernst Walter Mayr (July 5, 1904, Kempten, Germany – February 3, 2005, Bedford, Massachusetts U.S.), was one of the 20th century's leading evolutionary biologists. He was also a renowned taxonomist, t...
en.wikipedia.org/wiki/Ernst_W._Mayr
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First...
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faculty.evansville.edu/de3/b32002/PPoint/Species%20Conc...
faculty.evansville.edu/de3/b32002/PPoint/Species%20Concepts/sld009.htm
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Organisms are classified in the same species if they are potentially capable of interbreeding and producing fertile offspring. ... Biology Glossary search by EverythingBio.com...
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www.biochem.northwestern.edu/holmgren/Glossary/Definiti...
www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-B/biological_species_concept.html
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(a) The biological species concept is a way of defining species, one that employs as its numero uno (i.e., number one) criteria the concept of reproductive isolation...
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www.mansfield.ohio-state.edu/~sabedon/campbl24.htm
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