Christmas boobook species are on-going. Christmas boobook The Christmas boobook ("Ninox natalis"), also known more specifically as the Christmas Island hawk-owl, is a species of owl in the family Strigidae. Closely related to the hawk owls of Southeast Asia and Australia. "N. natalis" was first classified at species level by J.J.Lister in 1888. It was not until 1998 however that DNA testing confirmed its status as a separate species from other owls. "N. natalis" is endemic to Christmas Island, a small Australian territory of about 135 square km situated in the Indian Ocean approximately 360 km south of Java. The flora and
Failure to refer Failure to refer Failure to refer, also reference failure or failure of reference, is the concept that names can fail to name a real object. According to Bertrand Russell's theory of truth, there is only one actual world, and a statement's truth value depends on whether the statement obtains in the actual world. Continuing the tradition of Gottlob Frege, Bertrand Russell posited that a name picks out, or refers to, a real object in the world (Russell's correspondence theory of truth). The name "Genghis Khan" thus picks out the 12th and 13th century Mongol leader we know by that name.