Species is a complex concept which does not always fit into nice simple buckets. You might find ring species interesting [1]. 1. https://en.m.wikipedia.org/wik

Species is a complex concept which does not always fit into nice simple buckets. You might find ring species interesting [1]. 1. https://en.m.wikipedia.org/wiki/Ring_species https://en.m.wikipedia.org/wiki/Ring_species