Plenary Lecture, International Ethological Congress, Oxford 1981 Presidential Address, Marathi Vignyan Parishat 1984 Rajendra Prasad Memorial Lecture, Indian Society of Agricultural Statistics 1986 Agharkar Memorial Lecture, Maharashtra Association for Cultivation of Science, Pune 1988 Foundation Day Lecture, Society for Promotion of Wastelands Development, New Delhi 1989 Special Evening Lecture, Indian Academy of Sciences, Hyderabad Alumini Day Lecture, Indian Institute of Technology, Bombay 1990 Vikram Sarabhai Lecture, ICSSR 1991 Deusker Memorial Lecture, Centre for Social Sciences, Calcutta 1992 Plenary Lecture, International Congress of Behavioural Ecology, Princeton 1992 Suresh Chandra Memorial Lecture, Indian Institute of Technology, Delhi 1993 Congress on Traditional Sciences and Technologies of India, Keynote Lecture, Indian Institute of Technology, Bombay 1993 Dr. P.C. Mahalnobis Centenary Lecture, Indian Statistical Institute, Calcutta 1993 Indian History Congress, 54th Session, Special Evening Lecture, Mysore 1993 Evening Lecture, Annual Meeting of All India Peoples' Science Movements Network, Hyderabad 1994 Sri D.B. Narasimha Murthy Rao Endowment Lecture, Indian Institute of World Culture, Bangalore 1994 Special Lecture, Indian Academy of Sciences Mid-Year Meeting, Mysore 1994 Foundation Day Lecture, National Institute of Immunology, Delhi 1995 Salim Ali Memorial Lecture, Salim Ali Centre for Ornithology and Natural History, Coimbatore 1994 Persidential Address, Biology Section, 65th Annual Session of The National Academy of Sciences, India, Tirupati 1995 R.R. Kale Memorial Lecture, Gokhale Institute of Politics and Economics, Pune 1995 Dr. T.N. Ananthakrishnan Seventieth Birthday Felicitation Lecture, Madras 1995 Lecture, Bangalore Society for the Prevention of Cruelty to Animals and the Livestock Heritage Trust of India 1996 Foundation Day Lecture, National Botanical Research Institute, Lucknow 1996