The Paleolithic Age refers to the Old Stone Age when early humans lived in hunter-gatherer bands and migrated across Africa and Eurasia. Paleolithic humans obtained food through hunting game and gathering plants. They made simple stone tools and eventually learned to control fire. As the climate changed, they began using caves and animal hides for shelter. Later Paleolithic humans like Neanderthals and Cro-Magnons developed more advanced tools, art, religion, and language. The Cro-Magnons were the first modern humans.