So, remember that definition of a species you learned in your freshman bio class?
That's the generally accepted biological species concept, that a species consists of individuals that demonstrate their genetic similarities by being able to successfully interbreed with each other and only each other....While we know this biological species concept works for the animal kingdom, science doesn't yet have a constant rule that can be applied across the board to all species. Speciation is still a bit of a mystery. And that's especially because we don't have enough data, so BAM! that's right where my research goes.