Question: Name the fictional character whose species is American Pekin duck and has relatives named Ludwig Von Drake?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/species> <http://dbpedia.org/resource/American_Pekin_duck> . ?uri <http://dbpedia.org/property/relatives> <http://dbpedia.org/resource/Ludwig_Von_Drake>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/FictionalCharacter>}