https://phys.org/news/2018-10-earliest-hominin-migrations-arabian-peninsula.html > Distinguishing ecological settings for members of the genus Homo outside Africa > It has recently been argued that early Homo sapiens occupied a diversity of extreme environments, including deserts, tropical rainforests, arctic, and high-altitude settings, around the world. By contrast, the dispersals of other earlier and contemporaneous species of Homo, such as Neanderthals, appear to be associated with generalized use of different forest and grassland mosaics in and among river and lake settings. A lack of palaeoenvironmental information has made it difficult to systematically test this idea and indeed a number of researchers maintain that non-Homo sapiens species demonstrate cultural and ecological adaptive flexibility.