In his monumental research in ancient sanskrit literature the author has restored gaps in lexicons and removed doubts in the later sanskrit works about the identity of a very large number of birds of the Indian sub-continent. The ancient sages of India were great lovers of nature with keen powers of observation and an extraordinary sensitivity about aninal behaviour. The Vedas Puranas, Epics and Samhitas are full of descriptions of birds, animals and plants but the exact identification of names had got lost or confounded over the centuries.