Is it a species

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THE BIOLOGY OF SPECIATION (2010, background): “…barriers as vital to the speciation process, saying, “It will be argued that the true interspecific barrier is not sterility but Asyngamy—the cessation of interbreeding—but that the first will inevitably follow, sooner or later, as the incidental consequence of the second” (Poulton 1908, p. 65).”
Hybridization and the species problem in conservation (2015, background): “Generally, these processes are slow or characterize such a small fraction of the “lifetime” of an evolutionary lineage that typological species classification is a good description for the majority of biodiversity at any given time (Gould, 1992; Rieseberg and Burke, 2001).”
Species taxonomy of birds: Which null hypothesis? (2014, background): “…as those on oceanic islands, have challenged Biological Species Concept taxonomy since its initial formulation because, among other issues, one cannot assess reproductive isolation between them (Mayr 1940, Zink and McKitrick 1995, Helbig et al. 2002, Remsen 2010, Tobias et al. 2010, Winker 2010).”