>>16714902
Yeah, the other response is right. Dogs as a subspecies of grey wolves, but dogs and grey wolves can still produce viable offspring together. Subspecies is sort of loose in this sense, but as the other anon described, it’s typically geographically isolated members of the same species which are able to breed, but typically don’t due to preventative factors such as geographic obstacles, leading to different group features, such as the distinctions between different types of wolves. Some lizards on one side of a mountain range may be darker to match the rocks on that side, and lighter to match the rocks on the other side, which is how these differences start. This is where the argument comes from that by formal definition different races of human can be seen as subspecies, but that term is too loaded to be acceptable outside of a scientific context, let alone within one.