Local fishermen informed the forest department officials after spotting the carcass on the bank of the Roymangal river at Basirhat range of the mangrove forest, officials said.
"After carrying out a post-mortem, it was found that the tiger cub drowned in the river after the water level suddenly rose in the river following high tide," Dr Utpalendu Mondal veterinary surgeon of Sundarban Tiger Project said.