The only snake that builds a nest is

1. The question asks to identify the only snake species that exhibits nest building behavior. 2. Among all snake species, the King Cobra (Ophiophagus hannah) is unique in its practice of constructing a nest for its eggs. 3. The female King Cobra gathers leaf litter and other debris, forming a mound-like structure. She lays her eggs within this nest and often remains coiled on top or nearby to guard the eggs against predators until they hatch. 4. Other venomous snakes like the Chain viper, Krait, and Saw scaled viper do not build nests; they typically lay their eggs (or give birth to live young in the case of vipers) in sheltered locations like burrows, under rocks, or in dense vegetation.