Lateral lines are specialized sensory organs found in many aquatic animals, particularly in fish and some amphibians. These lines run along the sides of the body and are composed of a series of small pores that detect changes in water pressure and movement. This helps the animals sense nearby objects, predators, or prey, enhancing their ability to navigate and survive in their environment. The lateral line system is made up of hair cells that respond to vibrations and currents in the water. This sensory system is crucial for species like sharks, catfish, and goldfish, allowing them to hunt, avoid danger, and communicate with each other effectively.