Hooghly district, West Bengal. Evening is descending over a large marshy lake that stretches from the edge of a cluster of villages for a few square kilometres to the opposite bank, overgrown in this rainy season with a coarse grass called hogla. This indigenous plant once covered the district, giving it its name. And the thickets it formed was the natural habitat of a wild feline, the ‘fishing cat’, now on the verge of extinction.