Question: Which national park is home of Australia's second bird observatory, which received a royal visit from Charles and Diana in 1985?
Sentence (from "Diana, Princess of Wales"): Diana, Princess of Wales (Diana Frances; "née" Spencer; 1 July 1961 – 31 August 1997), was a member of the British royal family as the first wife of Charles, Prince of Wales, who is the eldest child and heir apparent of Queen Elizabeth II.
Relevant evidence: Yes