As there have been so few observations of the hairy-nosed otter in the wild, very little is known of its biology. However, this elusive species has been photographed early in the morning and late in the afternoon, and also been observed to be active at night (5). Fish and water snakes are the preferred prey of this otter, although it may supplement this diet with a variety of frogs, lizards, turtles, crabs, small mammals and insects (1). The most commonly employed hunting method is believed to be a quick lunge at speed that startles its prey and traps it in the roots of a semi-submerged tree, although this stealthy predator is also known to steal from fishing nets (5). In the water, the hairy-nosed otter has few natural predators, aside from pythons, and the Siamese crocodile (Crocodylus siamensis) in Tonle Sap Lake. On land, however, it may fall prey to feral dogs, and its cubs in particular may be taken by large birds of prey, such as the grey-headed fish eagle (Ichthyopaga ichthyaetus) (5).