Pichavaram the second largest Mangrove forest in the world, near the temple town of Chidambaram, is one of the unique Eco-tourism spots in South India. The backwaters, inter connected by the Vellar and Coleroon river systems, offer abundant scope for water sports, rowing, Kayak and canoeing.The Pichavaram forest not only offers waterscape and back water cruises, but combines another very rare occurrence - the mangrove forest trees permanently rooted in a few feet of water. The Pichavaram mangroves are considered among the healthiest mangrove occurrence in the world.The Pichavaram mangroves attract an appreciable bird population of residents, local migrants and true migrants. At the mangroves, so far, 177 species of birds belonging to 15 orders and 41 families have been recorded.The season for birds is from September to April every year. Peak population of birds could be seen from November to January. This is due to high productive nature (in terms of prey organisms) of the ecosystem and coincidence of the time of arrival of true migrants from foreign countries and local migrants from their breeding grounds across India.