Compare 'human' with personal names:
Human: a universal applicable to Zayd, Amr and Bakr.
Zayd: one particular individual.
Amr: another individual of the same species.
People may differ in age, color, language and learning without becoming different logical species. Species identifies their shared specific nature.
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One species, many individuals
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Compare 'human' with personal names:
Human: a universal applicable to Zayd, Amr and Bakr.
Zayd: one particular individual.
Amr: another individual of the same species.
People may differ in age, color, language and learning without becoming different logical species. Species identifies their shared specific nature.