Ocean Life - Shark agonistic displays: signaling battle readiness without combat

Physical violence takes a heavy biological toll, which is why approximately twenty-three shark species utilize ritualized agonistic displays when facing competitors. Instead of immediately attacking, a threatened shark performs distinct postural and kinetic movements that differ sharply from its ordinary swimming behavior. This display communicates essential facts to rivals, including body size, physical fitness, weaponry, and determination to fight. By signaling their readiness to clash, sharks can settle territorial disputes while avoiding unnecessary and costly injuries.

Source: Wikipedia