These are a sensory system, usually found running as a line on the sides of fish, but also found in aquatic tetrapods. They sense differences in water pressure, allowing the animal to tell whether something is moving close to them.
These are a sensory system, usually found running as a line on the sides of fish, but also found in aquatic tetrapods. They sense differences in water pressure, allowing the animal to tell whether something is moving close to them.