I'm not a biologist, but my understanding is that animals that can interbreed but usually wouldn't are (if at all) divided into subspecies within the same speci

I'm not a biologist, but my understanding is that animals that can interbreed but usually wouldn't are (if at all) divided into subspecies within the same species. See https://en.wikipedia.org/wiki/Subspecies https://en.wikipedia.org/wiki/Subspecies "A taxonomist decides whether to recognize a subspecies or not. A common way to decide is that organisms belonging to different subspecies of the same species are capable of interbreeding and producing fertile offspring, but they do not interbreed in nature due to geographic isolation or other factors."