The nose structure of dolphins is different from ours. Dolphins have no pores or nostrils, but only one jet hole for breathing, which is located at the top of the upper forehead. This feature is different from that of the suborder baleen whales. Breathe through this hole, not kiss. Exhale underwater, inhale after floating, and close your nostrils when diving again to prevent seawater from infiltrating into your lungs.

It has whale wax on its head for echolocation. The echolocation principle of dolphins is the same as that of bats. One part is used to make sounds, and the other part receives echoes. When vocalizing, the frontal lobe concentrates sound waves into bundles of parallel lines and sends them out. When listening, the bone tissue of the mandible transmits scattered sound waves to the inner ear behind the mandible.

Extended data:

Most dolphin species have obvious snouts, and some species have curved mouths, so they look like smiles. In addition, many dolphin species have small conical blunt teeth on their mandibles, and some species have as many as 250 teeth.

Dolphin wounds, such as shark bites, can heal quickly, and even some deep wounds are not easy to cause dolphins to bleed to death, but the specific reasons are unknown. In addition, these wounds are rarely infected.

Dolphin's skin is as soft as satin and spongy. Dolphins update the cells in the outer cortex every two hours to ensure that the occurrence of countercurrent is reduced, and at the same time, they are allowed to swim at a speed of up to 60 kilometers per hour and jump from the water to 7 meters in the air. These excellent characteristics have been applied to the production of diving suits and shipbuilding technology through the research of scholars.