query: SELECT ?item ?taxonName ?birdLifeId ?iucnId WHERE {  
       ?item wdt:P5257 ?birdLifeId .
       ?item wdt:P225 ?taxonName .
       OPTIONAL {?item wdt:P627 ?iucnId }
       FILTER (?birdLifeId != ?iucnId)
       #FILTER (!BOUND(?iucnId))
  }
  ORDER BY ?taxonName