Ecologists study the relationships between organisms and their environments. They perform research in fields to understand species and how they interact with the environment. Ecologists work in a variety of roles, including in national parks as guides, in government and academic institutes conducting research, and for private firms examining environmental issues or advising industries. Some prominent institutes for ecology in India include the Global Institute of Ecology & Environment in Kolkata, the Indian Institute of Ecology and Environment in New Delhi, and the School of Human Ecology at Dr. B.R. Ambedkar University in Delhi.