Herpestes palustris

Bengal mongoose (Herpestes javanicus palustris) is a subspecies of the Javan mongoose. It is also known as the marsh mongoose, not to be confused with Atilax paludinosus, which is also called the marsh mongoose. Other synonyms include Indian marsh mongoose and Bengali water mongoose.
(Clicked at 12:38 pm on Monday, 13 Jan 2020 at Chintamoni Kar Bird Sanctuary (Kayal-r Bagan), Narendrapur, near City of Kolkata, West Bangal, India