A survey of the kole wetlands in Thrissur and Malappuram districts found a decline in the number of birds.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/survey-finds-decline-number-birds-kole-wetlands
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-thiruvananthapuram
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerala
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wetlands
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/malappuram-d
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thrissur-d
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife