The land changed over time from open grasslands to wooded forests and then back again. Rhinoscerous were being replaced by reindeer (Wong, 2). .As we map further south, the mammals are documented to be more dominant, as there are fewer and fewer trees. This is supported by evidence that as more anatomically modern humans began to show up, and that dwellings were moving away from trees and caves. Some scientists attribute the dependence of sedentary herbivores as the demise of the Neandertal population (Holden,1). The Neandertal was accustomed to hunting herds of wild deer and bison. These changes in environment were too much for the Neandertal to keep up with. When a forested area became a grassland, it took away the stealth that a Neandertal would have to hunt from a tree in ambush. When these animals became infrequent, the Neandertal had a hard time keeping up with migratory animals. A culture appeared later (about 35,000 years ago) called the Gravettian who had the technology and capability to follow migrating animals. A recent study suggested that most Neandertals were gone as long as 41,000 to 39,000 years ago (Bower,1). This study attributes previous reports of surviving Neandertals