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Because of the taxonomic definitions of genus and species I prefer to replace "For example, a human being as a species can be defined as an animal (genus) that can reason (differentia)." with somethin that is not a bilogical species (so there is no possible confusion that in this case genus is Homo and species is sapiens). Perhaps: for example, a tricycle is a huiman powered vehicle (genus) with three wheels (species)." though I think something still better can be found. RJFJR ( talk) 16:02, 13 March 2009 (UTC) reply