Ship's bunks are beds found on a ship. They are typically located in the crew quarters and are usually stacked in tiers, with each bunk having a mattress, pillow, and blanket. Ship's bunks are designed to be comfortable enough for sleeping but also to be able to withstand the motion of the sea. They are often used by sailors and other crew members when they are away from home for long periods of time. The term 'births' is a six-letter word that is used to describe these bunks.