Sharks Have Friends, Like Jazz: 9 Surprising Facts About Sharks

Sharks, often perceived as simple, instinct-driven predators, are in fact among Earth's most ancient and resilient vertebrates. These creatures have navigated the planet's history for hundreds of millions of years, surviving all five major mass extinction events, including the one approximately 252 million years ago that eradicated about 90% of all marine life. Their evolutionary success has allowed them to inhabit nearly every corner of the world's oceans.

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Sharks, or their close ancestors, survived all five major mass extinctions in Earth's history. Among them was the 'Great Mortality,' about 252 million years ago, when about 90% of marine life disappeared.

Beyond their remarkable survival skills, sharks demonstrate surprising cognitive capabilities. Far from being mere instinctual hunters, research shows they can learn, remember information for extended periods, and distinguish between various stimuli like sounds, shapes, and colors. Experiments with young gray bamboo sharks revealed they could retain information about shapes and optical illusions for nearly a year. They can also differentiate between quantities, distinguishing, for instance, between three and five, though they struggle with finer distinctions like four versus five.

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Far from the image of a simple, instinctive predator, sharks prove capable of learning and distinguishing sounds, shapes, colors, and abstract patterns.

Intriguingly, some shark species display preferences that challenge stereotypes. Port Jackson sharks, for example, have shown a tendency to favor jazz music over classical music. In studies, researchers trained sharks to swim to a specific location for food when they heard music. The sharks consistently associated jazz with the reward, a connection they did not form with classical music, suggesting a potential rhythmic preference.

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Port Jackson sharks seem to prefer jazz over classical music.

Their reproductive methods are equally fascinating and diverse. Certain species, like bull sharks and hammerheads, utilize internal fertilization and nourish their young via an umbilical cord, similar to mammals. The newborns even retain a temporary umbilical cord mark. Other species have even more unusual strategies; sand tiger sharks, for instance, engage in intrauterine cannibalism. In their mother's womb, the larger embryos consume their smaller siblings, ensuring that only the strongest survive to be born well-developed and robust. Some sharks also reproduce by having eggs hatch inside the mother's body, with live young being born.

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Some species, like bull sharks and hammerheads, carry their young and feed them through an umbilical cord, like mammals.