Gharials are the only survivor of the Gavialidae family. The gharial is the most easily distinguished of the crocodilians because of its long snout. In Nepal, gharials are restricted to remnant populations in the Karnali, Babai and Narayani rivers (tributaries of the Ganges). During winter, the level and the temperature of water facilitate the observation of the gharials on the sand because of their basking behavior. It is a large fish-eating crocodile with a long, narrow snout that widens at the nostrils.