Petroglyph rock art dating to 8,000 YBP at the sites of Shuwaymis and Jubbah, in northwestern Saudi Arabia, depict large numbers of dogs participating in hunting scenes with some being controlled on leashes. The transition from the Late Pleistocene into the early Holocene was marked by climatic change from cold and dry to warmer, wetter conditions and rapid shifts in flora and fauna, with much of the open habitat of large herbivores being replaced by forests. In the early Holocene, it is proposed that along with changes in arrow-head technology that hunting dogs were used by hunters to track and retrieve wounded game in thick forests. The dog's ability to chase, track, sniff out and hold prey can significantly increase the success of hunters in forests, where human senses and location skills are not as sharp as in more open habitats. Dogs are still used for hunting in forests today.