So I just started reading Heterogenia Linguistico and I had some nerdy thoughts.
In the first chapter it is revealed that the main character (a PhD? grad student? or smth,) has a professor who secretly had a love child (?) with a werewolf in a far-flung place.
Technically speaking, species are typically defined by reproductive barriers. The fact that Prof had a child with one of the wolf-kind indicates that humans and werewolves are both homo sapien sub-species, or at least closely related hominids. (So the werewolf isn't really an animal in the sense of not being human.)
This is impossible to know without knowing whether Susuki (said child) can have offspring in the future. Even then it is hard to tell because in the cases when only one sex of a hybrid is sterile, it is always the heterogametic sex. For werewolves to mate with humans, they have to also use the XY sex chromosome system, which would mean Susuki is of the homogametic sex and could still in theory have offspring even if male wolf-human hybrids cannot.
Anyway, the fact that werewolves and humans can have children together is actually extremely weird given the degree of morphological differences between werewolves and humans, not to mention the differences in perception (werewolves have stronger sense of smell and decreased perception of color, whether this is caused by only having two types of cones like real wolves is hard to say,) which indicates significant differences in brain structure. By all metrics, humans and werewolves shouldn't be genetically compatible.
The fact that they are so similar genetically despite vast morphological differences really only makes sense if there was some alien (not necessarily not a human) species that conducted gene modification experiments on humans, resulting in werewolves and humans. If other non-human species in this manga can also have offspring with humans this would lend credence to my claim.
Obviously the mangaka is not going to go this route, (I'm only on chap 8 no spoilers plz,) and is relying on suspension of disbelief. Personally I'm not sure if I can swallow the pill but eh...
On a side note, is this manga even about linguistics? Seems much more anthropological. We haven't really seen any jargon or technical discourse so far.