The Padmaja Naidu Himalayan Zoological Park (PNHZP) in West Bengal's Darjeeling has been adjudged the best zoo in the country, while Kolkata's Alipore Zoological Garden has secured the fourth position. A zoo directors' conference was held in Bhubaneswar on September 10 and the Central Zoo Authority released the ranking list in the Odisha capital. There are around 150 zoos across the country.