It is the largest surviving toothed whale, known for its massive head and complex sonar system. The head accounts for one-third of its body length and contains special ear structures that are crucial for their navigation and communication in deep-sea environments. The ears of sperm whales do not have obvious external ear structures like terrestrial mammals, but are hidden in complex structures on the head. Characterized by high adaptability to deep-sea environments, including an inner ear structure capable of withstanding extreme water pressure. The hearing is very sensitive and can detect very low frequency sounds that travel far underwater, helping to locate prey, navigate, and communicate with companions.