Traditional   taxonomy  uses  a
   hierarchical   classification   where   organisms   are   placed  into
   progressively more restricted groups (taxa).
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   Starting  from  the  most  comprehensive  taxon,  Linnaeus  classified
   organisms  into  kingdom,  phylum,  class,  order,  family, genus, and
   species.
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   Leopards and humans belong to kingdom Animalia, phylum Chordata, class
   Mammalia.
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   While leopards are in order Carnivora, humans are in order Primates.
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   A  taxon above kingdom called domain was added after Linnaeus proposed
   these 7 levels.
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