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A group of organisms belong to the same biological species if they are capable of interbreeding to produce fertile offspring.
A '''species''' is a group of living beings or organisms having common ancestry and therefore significant genetic similarities in common. The boundary between one species and another is the ability to mate and produce offspring. A tiger and a clam are different species, because they cannot mate. A German Shepard and a Beagle can mate, because they are different breeds within one species.
A '''species''' is a group of living beings or organisms having common ancestry and therefore significant genetic similarities in common. The boundary between one species and another is the ability to mate and produce offspring. <ref>A group of organisms belong to the same biological species if they are capable of interbreeding to produce fertile offspring. [http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-S/species.html Holgrem Lab], Northwestern University, Illinois </ref>
A tiger and a clam are different species, because they cannot mate. A German Shepard and a Beagle can mate, because they are different breeds within one species.
==Note==
<references/>
==See also==
==See also==
[[Biological classification]]
[[Biological classification]]