Morepork Synopsis of Birds", but did not give it a binomial name. German naturalist Johann Friedrich Gmelin described the morepork in 1788. "Morepork" has been designated the official name by the International Ornithological Committee. Both Gerlof Fokko Mees and Ernst Mayr regarded the taxonomy of the boobook owl as extremely challenging, the latter remarking in 1943 that it was "one of the most difficult problems I have ever encountered". In his 1968 book "Nightwatchmen of the Bush and Plain", Australian naturalist David Fleay observed that the boobooks from Tasmania more closely resembled those of New Zealand than those from mainland Australia,
Failure to refer Any sentence in which we attach a predicate to the name "Genghis Khan" is true if the predicate obtained in the actual world. Any sentence in which the predicate does not obtain for Genghis Khan is false. The Wikipedia statement “"Genghis Khan founded the largest contiguous empire in world history"” is thus true, and the statement “"Genghis Khan was one of the most successful playwrights of late Victorian London"” is false. As an example for a name that fails to refer to a real object, Russell used “"the present king of France"“ in a 1905 article. According to the Russellian