Which scientist is known as "Birdman of India"?

The correct answer is Option (1) → Salim Ali

Salim Ali (1896–1987), India’s best-known ornithologist (a scientist who studies birds), is called the “Birdman of India”. He carried out the first systematic bird surveys across the country and wrote The Book of Indian Birds and, with S. Dillon Ripley, the ten-volume Handbook of the Birds of India and Pakistan. He was awarded the Padma Vibhushan in 1976.