Assam's Guwahati became the first city in the country to have its own city animal with the district administration declaring the Gangetic river dolphin as the mascot.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/gangetic-river-dolphin-be-city-animal-guwahati
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/assam
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dolphin
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/brahmaputra
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ngo
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kamrup