There are distance courses that you could take up. IGNOU for one offers M.Sc in Zoology -http://www.ignou.ac.in/ignou/aboutignou/school/sos/programmes/detail/370/1. If you specify which area you are in, then it would be better to precribe any course or university. Alternately, you could look up the scholarships that are available at the universities. If you meet the criteria, then you could apply for them and do a proper course instead of a distance one..