Our species - Homo Sapiens - originated in Africa and from there gradually spread throughout the world. However, the territories where he came were not empty; other species of hominids already lived there. For example, non-standard and Denisovans, who, although they could not withstand the competition with our species, nevertheless interacted with it for some time. Traces of this were found in our DNA, and more recently genes of other, so far unknown protomen were found in it.
In the past, people of different species interbred relatively easily and successfully with each other, which became the key to the survival of our species. Homo Sapiens have adopted useful genes from species that have long existed in certain climatic conditions. Approximately 2% of the genes of modern people of Western civilization are from non-standard people, and among Asians the genes of Denisovans prevail. Researchers from the University of Adelaide recently proved that there are actually three groups of ancient genes in the DNA of Southeast Asians.
The first species of people, conventionally named "Extinct Hominid 1", lived on the mainland of South Asia. The second species, "Extinct Hominid 2", lived on the islands of the Philippines and Indonesia, and therefore did not intersect with the first. Analysis of the remains of ancient vegetation and migration routes showed that after contact with Homo Sapiens, both species quickly disappeared - they became extinct or were destroyed by newcomers.
Each of these unknown species at that time lived in isolation for hundreds of thousands of years. However, because of this, they were stuck at the beginning of civilizational development and remained savages by modern standards. Therefore, they became victims of our more advanced ancestors, who not only settled their territories, but also inherited some useful genes from the former inhabitants of these lands.