Can you imagine how many grass grazing animals would have been just standing around waiting to be eaten? During the Pleistocene, some regions supported huge, stable herds of grazing megafauna that could provide reliable food. You just needed some friends to help you hunt. In areas with relatively mild climates and predictable seasons, people likely experienced long stretches, even generations, of comparatively low stress and easy resources. Granted, life could quickly become difficult when climate, animal populations, or competition shifted.