Elephant dung in high demand

Currently from 35 km from Patna, Bihar a cattle fair is being held, and the most amazing news from it is the most selling product is elephant dung. Surprised and want to know why so?
Elephant dung is found to be a natural mosquito repellent without any harmful effect and this has utilization as it could be used as a bio fuel. Villagers are buying this and taking to home, after that they use to burn it to create smoke which is known to be a insect killer. This is like any herbal medicine for really cheap price; rs 4 a kg, farmers use this to save themselves and their cattle from insects. The farmers use to buy elephant dung for cheap price and they are buying it in large quantity for upcoming winter season.