Human beings are an invasive species native to Africa. They are responsible for the extinction of some native animals of other continents
Historically, some ecotypes of H. sapiens sapiens became naturalized to their new environments and were able to fit themselves in without too much disruption of the ecosystems already in place.
However, other ecotypes proved more aggressive; upon introduction to new environments, they not only outcompeted and occasionally drove the naturalized ecotypes to extinction, but proved devastating to other species around them. The western European ecotype in particular is known for this.
It is interesting to note that, much like in Orcinus orca (the “killer whale”, another animal with complex social habits), an individual H. sapiens sapiens may have difficulty socializing outside of its own ecotype. Mistrust and violent reactions to those outside of an individual’s own ecotype (commonly referred to among sapiologists as “racism”) has been observed in the species for millennia.
This “racism” is not, of course, a rule of the species, and over the last fifty years, there has been a marked increase in social relationships and even matings between individuals of differing ecotypes. Sapiologists hope that this trend will continue, as it may lead to an overall decrease in conflict and aggressive behavior in the species over time.