query: #Katzen
  SELECT ?role ?roleLabel ?roleDescription (COUNT(?item) as ?count)
  WHERE 
  {
    ?item wdt:P31 wd:Q5.
    ?item wdt:P2868 ?role.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  GROUP BY ?role ?roleLabel ?roleDescription
  ORDER BY DESC(?count)