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 most successful playwrights of late Victorian London” have the same truth value: false. This equality may present problems for those wishing to distinguish such statements in terms of truth value. Some statements are false with reference to the actual world but potentially true in reference to some fictional world. Coleridge's poem "Kubla Khan" ("In Xanadu did Kubla Khan a stately pleasure-dome decree") does not, strictly speaking, suffer reference failure. The 18th century version of the name Kublai Khan picks out a Mongol emperor, the grandson of Genghis Khan. But since few of the events in Coleridge's narrative poem obtain in