The Handbook of the Birds of India and Pakistan is the `` Magnum Opus '' of the Indian ornithologist S. Dillon Ripley , written together with Salim Ali . The Handbook of the Birds of India and Pakistan is the `` magnum opus '' of Indian ornithologist S. Dillon Ripley , written along with Salim Ali . The Handbook of the Birds of India and Pakistan is the `` magnum opus '' of Indian ornithologist Salim Ali , written along with S. Dillon Ripley .