Cobra

A cobra is a venomous snake of family Elapidae, of several genera, but particularly Naja. (Non-cobra elapidae include the taipan, brown snake, tiger snake, fierce snake, coral snake, mamba and sea snakes.) Cobras generally inhabit tropical and desert regions of Asia and Africa. The cobra's most recognizable feature is its hood, a section of its neck which it can flatten outwards in a threat display to appear bigger. Since snakes do not have a sternum they can stretch their ribs outwards which expands the hood. The hood can also carry distinctive markings. The hood of the Asian cobra is proportionately much larger than that of the king cobra and is usually yellow to brown, with a black-and-white spectacle pattern on top and two black and white spots on the lower surface. Most snakes can flatten their necks to some degree; cobras are only more adept. Cobras come in varying colors from black or dark brown to yellowish white. Elapidae cannot fold their fangs down, as Viperidae can, so... full article at wikipedia