Links:
[1] http://admin.indiaenvironmentportal.org.in/news/taiwan-potty-train-pigs
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pigs
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/animal-dung
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toilets
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution-control
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/taiwan