According to Wildlife Institute of India (WII) study in 2017, the number of leopards have increased in the forested areas of Aravali in Gurugram and Faridabad, from almost virtually none in 1980s to 40 to 45 leopards. This area also has high concentration of 27 species of 14 families of wild animals such as hyena, jackal, wolf, fox, jungle cat, mongoose, civet, porcupine, hare, wild pig, rhesus macaque, nilgai, grey francolin and chinkara in the rapidly degrading ecosensitive areas of Raisina, Manesar, Nuh, Mohamadpur Ahir, Bhondsi, Damdama, Mangarbani and Mandawar. Northern Aravalli leopard and wildlife corridor between from Sariska Tiger Reserve in Rajasthan to Delhi Ridge is a 200 km long important biodiversity and wildlife corridor which is a habitat for the Indian leopards and jackals of Aravalli, who often migrate between Delhi and Sariska, but the urban development, specially the highways and railways bisecting the Aravalli range and wildlife corridor in several place pose a great risk. According to a 2019 study by Bombay Natural History Society (BNHS) at the Asola Bhatti Wildlife Sanctuary, 27 species of 14 families are found in the area, the number of golden jackal has doubled from 8 to 19 in 8 km tract where rodents and hares are their prey base along with the staple diet of zizipus jujube (jhad ber), ruddy mongoose and jungle cats are often sighted too, though striped hyena have been vanishing. Leopards pugmarks have often been sighted at Asola Bhatti wildlife sanctuary and the contiguous forested areas of Gurugram-Faridabad Aravalli hills such as Mangar Bani, Badkhal Lake wildlife area, Mohbtabad, Roj ka Meo.