They may not quite live up to the legend of "Jaws", but with big whites that are up to 20 feet long and most species that have been tricked with multiple rows of teeth, they are pretty intense.
But the stories about their horror were greatly exaggerated.
Although sharks are incredible predators, they are not a big threat to humans. In fact, humans are more likely to kill sharks than vice versa. According to one study, humans are responsible for the death of about 100 million sharks a year.
Take a look at Shark Awareness Day for some other surprising facts about sharks.
They fight global warming better than your metal straws.
Sharks do more than most guards among us. At the top of the marine food chain, they are biologically charged to keep prey populations in check.
For example, they feed on animals like sea turtles, which eat large amounts of seagrass. Seagrass stores large amounts of carbon from the atmosphere. However, if the turtle population no longer grows sustainably, this substantial carbon storage is threatened. Sharks, the natural predators of sea turtles, are the only ones who can keep this in check. But that's a difficult task when people kill sharks in astronomical numbers.
They Survived the Dinosaurs
Sharks not only lived after the age of dinosaurs, they emerged in a time before these giants even entered the earth. Shark fossils were found 450 million years ago, suggesting that they occurred in the Silurian period, an early part of the Paleozoic era. That was 1
90 million years before Dinos even showed up.
They would give nightmares to a dentist, but they will not destroy you.
With an average of 45 teeth and seven auxiliary rows, a Haimund would give anyone nightmares. Sharks lose up to 30,000 teeth during their lifetime, which is why the seabed is covered with them.
Her teeth and jaws are a pretty bad duo, with a Great White Shark biting at nearly 17,790 Newtons (about 4,000 pounds per square inch). These bad guys rarely find their way to human flesh. You have about 1 in 3,748,067 chances of becoming a victim of a shark attack.
Your Libra helps them move faster
Fish are food, not friends – but sharks still do not eat much of it
"Finding Nemo" might have wanted to tell us something else, but science says it's a lie. Sharks actually eat up to 3 pounds of fish a day and are opportunistic feeders. They can use their sense of smell and hearing to locate prey and use the "lateral lines" on their bodies to feel vibrations in the water.
They have long gestation periods and some races in which they were born.
This is stranger than stunning, but it's just new enough to mention. According to a long-term study on lemon sharks, it is known that this particular species returns to the place of their birth to mate.
And if you think nine months are bad, then the 3½ years that a normal frill shark spends pregnant is the worst of all horrors. The gestation period of sharks can vary from five months to a few years, and some sharks can store sperm for months.
The only things that rival their noses are their ears
Not only sharks are notorious for their keen sense of smell, their hearing is also incredibly strong. Sharks can hear prey at a distance of up to a kilometer, even the tiny noises like water problems and muscle contractions.
People who lack the 7 rows of teeth are still worse.
For every person killed in a shark attack, humans kill an estimated 2 million sharks. In fact, the US average for annual shark attacks is 19, with one death every 2 years. By comparison, 37 people die each year from lightning strikes.