The term of art here is "species concept", of which there are several, well covered in [1]. Interfertility is a feature of some, but not all. [1] https://bio.l

The term of art here is "species concept", of which there are several, well covered in [1]. Interfertility is a feature of some, but not all. [1] https://bio.libretexts.org/Courses/University_of_California_Davis/BIS_2B%3A_Introduction_to_Biology_-_Ecology_and_Evolution/02%3A_Biodiversity/2.01%3A_Species_Concepts https://bio.libretexts.org/Courses/University_of_California_...