Do water moccasins make a sound before attacking?

Water moccasins, also known as cottonmouths, typically do not make a distinct sound before attacking. However, they may hiss or emit a warning sound if threatened, which serves as a deterrent rather than a precursor to an attack. Their behavior often involves a defensive posture, and they rely on their camouflage and sudden strikes rather than vocalizations to catch prey or defend themselves.