Rise in pollution levels, dying natural habitats and threat of poaching have led to a decrease in the number of migratory birds at the Harike wetland. Spread over 100 square kilometres, the wetland attracts lakhs of birds from Central Asia and trans-Russian region every year.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pollution-poaching-keep-away-birds-harike
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-chandigarh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wetlands
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/harike-sa
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/migratory-species
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/poaching
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ngo
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab