"Early European Farmers" (EEF) and "Ancient North Eurasian" (ANE). WHG represents the remnant of the original Cro-Magnon population after they re-peopled Europe after the Last Glacial Maximum. EEF represents the introgression of Near Eastern populations during the Neolithic Revolution, and ANE is associated both with the Mesolithic Uralic expansion to Northern Europe and the Indo-European expansion to Europe in the Chalcolithic. Pressures favoring migration Homo ergaster specimens indicate a change toward a diet more reliant on animal products, evident by greater encephalization with higher energy requirements. This transition to becoming more carnivorous affected the way of life unlike primates before. Archaeological evidence of cut bones from large mammals and broken stone tools increasing in frequency support this increasing trend. To meet increasing demand of calories, the range of hominids would have expanded, making the necessary hunting versus prior scavenging possible. It is believed that the adjustments required to meet these new demands would expand the home range size eight to ten times. Range could also increase or decrease in size due to environmental changes. A more recent example is absence of humans in Britain during the last glacial maximum which ended in the Late Pleistocene, 10,000 years ago. At this time, Russia had an influx of people following the major prey species shifting to this region. It has been argued that Neanderthals', and previous hominids', expansion northward were limited by lacking proper thermoregulation. Behavioural adaptations such as clothes-making to overcome the cold is evident in archaeological finds. The potential to expand also grew with the Neanderthal reaching the status of top carnivores. These humans could fear less during expansion, without the worry of other predators. The desire to push into these northern areas was influenced by this requirement to eat a lot of meat to satisfy the human brain which uses 20% of the body's energy. Larger game for hunting is available the closer you are to the poles. See also History of Europe Human migration Early human migrations Historical migration References External links The Settlement and Colonization of Europe Prehistoric Europe