The king cobra is the longest venomous snake in the world. They have short, hollow fangs measuring less than a half an inch. King cobras come in a variety of colors, dependent on their range. They can be light olive, black-brown or something in between. They may have bands of white, yellow or beige. Their underside is uniformly pale yellow and may have bars. The famous (or infamous) king cobra "hood" is created by extending elongated cervical ribs of the neck that spread loose skin.