“…This chapter has been prepared on the basis of field studies conducted by the authors (CS & CV) on the east coast, west coast and in the Andaman and Nicobar Islands Jayson, 2000, 2009;Jayson and Sivaperuman, 2003, 2004, 2005Sivaperuman, 2011Sivaperuman, , 2013Sivaperuman et al, 2010;Venkatraman, 2008;Venkatraman and Gokula 2009). In addition, the available important literature was also consulted (Sampath, 1989;Sampath and Krishnamurthy, 1989;Balachandran, 1990Balachandran, , 1995Balachandran, , 2006Kurup, 1991Kurup, , 1996Anon.…”