Southern boobook taxa (southern plus Tasmanian boobooks and moreporks) as a single species. Examining both morphological and genetic (cytochrome b) characters in 2008, German biologist Michael Wink and colleagues concluded that the southern boobook is distinct from the morepork and Tasmanian boobook (which they proposed to be raised to species status as "Ninox leucopsis"), and that it is instead the sister taxon to the barking owl ("N. connivens"). A 2017 study by Singapore-based biologist Chyi Yin Gwee and colleagues analysing both multi-locus DNA and boobook calls confirmed a sister relationship of "N. n. novaeseelandiae" and "N." ("n.") "leucopsis" and their close relationship
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