Humans are pretty adaptable compared to other hominin species, and other apes, which may have been key to the survival of our species. Most animals stick to particular habitats, or are wide-ranging, and based on that scientists classify species on a continuum between generalist and specialist.
But homo sapiens are unique in that they can specialize, and they can generalize. We are specialist-generalists. Some humans have adapted intensively to one ecological niche, most famously high-altitude zones, while other wander across ecological zones. Yet we are still all one species, able to intermarry, or switch regions and adapt. That makes homo sapiens unique across species.
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