Cobras are venomous snakes related to taipans, coral snakes, and mambas, all members of the Elapidae family. Snakes in this family cannot fold their fangs down, as vipers can, so the fangs are generally shorter. They kill their prey by injecting venom through their fangs. The venom is a neurotoxin that stops the victim's breathing and heartbeat. A cobra only attacks a human if it feels threatened. As with any venomous snake, a bite from a cobra can be deadly if not treated properly. Cobras come in varying colors from black or dark brown to yellowish white. They have specialized muscles and ribs in the neck that can flare out when the cobra feels threatened. Cobras are able to raise their body up, spread the hood, and hiss loudly to scare off most threats.