Archaeologists have discovered over a hundred prehistoric tools, including cleavers and hand axes, in Mangar Bani, a forest region near Delhi, Gurugram, and Faridabad. These tools date back 200,000 to 500,000 years, suggesting ancient human habitation. Mangar Bani, part of the Aravali hills, is noted for its extensive, intact tropical dry forest, home to 240 bird species and unique dhau trees. Its preservation is partly attributed to local villagers considering the forest sacred, fearing divine retribution for cutting trees.