The dinner bell has been a long-standing tradition in the United States, especially during the agrarian period of American history. In the Western U.S., the dinner bell was often a simple metal triangle hung from a chuck wagon and rung by someone nicknamed Cookie. The ringing of the dinner bell was

Underwater, sound behaves differently than when traveling through air. Although water is denser than air, sound travels farther and about four times faster in water due to its greater elasticity. Low frequency sound waves below 500 hertz can travel thousands of miles through the ocean without losing much energy. Sharks have adapted to tune in to low-frequency pulsing sounds. However, sharks do not have visible ears like humans do. Instead, they have only inner ears consisting of three D-shaped, fluid-filled canals that allow the shark to orient and balance itself and tiny hair-like structures that sense the vibrations of sound waves. Sharks also use the lateral line, a series of fluid-filled tubes that crisscross their body just beneath the surface of their skin, to sense low-frequency sound vibrations. The lateral lines and inner ears of sharks are used to locate prey, including injured fish as far away as 800 feet. Studies have shown that the flapping sounds injured fish make attract sharks, and even audio recordings of flapping fish broadcast underwater can elicit a response from sharks. The lateral lines and inner ears of sharks are highly developed and enable them to detect faint changes in pressure, including those made by the vibrations of sound waves. To learn more about sharks, swim over to the next page.

The list consists of various sources about sharks and their senses, including attraction to acoustic signals in the near-subsonic range, low-frequency sounds, hearing and vibration detection, and underwater sound. It also includes information about the senses of silky sharks and the life of Ivan Pavlov. The sources come from different institutions, such as the Rosenstiel School of Marine and Atmospheric Science, the University of Miami, the Department of Defense, PBS, Sea World, SharkTrust, and McGraw-Hill. The list provides a comprehensive guide to anyone interested in learning more about sharks and their sensory abilities.

FAQ

1. What is a “yummy hum”?

A “yummy hum” is a term used to describe the sound that sharks make when they eat. It is a low-frequency sound that is created by the movement of the jaw muscles and the vibration of the teeth as the shark chomps down on its prey. The sound is also known as the “shark’s crunch” or “bite sound.”

2. How do sharks use the “yummy hum”?

Sharks use the “yummy hum” to attract other sharks to the area where they are feeding. The sound can travel long distances in the water, and other sharks can detect it using their keen sense of hearing. The “yummy hum” also helps sharks to locate and identify their prey, even in murky or dark waters.

3. Do all sharks make the “yummy hum”?

No, not all sharks make the “yummy hum.” The sound is most commonly associated with larger sharks, such as great whites, tiger sharks, and bull sharks. Smaller sharks, such as reef sharks and nurse sharks, may not make the sound at all or may make a different sound when they eat.

4. Is the “yummy hum” dangerous to humans?

No, the “yummy hum” is not dangerous to humans. It is simply a sound that sharks make when they eat. However, if you are in the water with a shark that is feeding, it is best to stay away and not interfere with its meal.

5. Can humans hear the “yummy hum”?

No, humans cannot hear the “yummy hum” because it is a low-frequency sound that is outside of our hearing range. However, scientists can detect and record the sound using specialized equipment.

6. What other sounds do sharks make?

Sharks can make a variety of sounds, including growls, hisses, barks, and clicks. These sounds are used for communication, hunting, and navigation. Some species of sharks, such as the hammerhead shark, can even use their fins to produce sounds.

7. Can sharks communicate with each other using sounds?

Yes, sharks can communicate with each other using sounds. They use a variety of sounds to convey information about food, threats, and mating. The “yummy hum” is just one of the many sounds that sharks use to communicate.

8. How can scientists use the “yummy hum” to study sharks?

Scientists can use the “yummy hum” to study the feeding behavior of sharks. By recording the sound and analyzing it, researchers can learn more about what sharks eat, how they hunt, and how they interact with their environment. The “yummy hum” can also be used to track the movements of sharks and to monitor their populations in different areas.