19 Fun Facts About Sharks

Articles Jul 08, 2019 05:43

It's hard to think of creature more awesome, in a literal sense, than the shark. They are perfect inspiration for movies, also have many documents and research about them. Do you know that some sharks could glow in the dark and they can live up to 400 years?

1. Their favorite sound is a faint buzz called a “yummy hum.”

19 Fun Facts About Sharks

Blood in the water may be the most obvious signal that shark bait is lurking, but did you know that sharks also respond to sound? Sharks are able to pick up on super low frequencies that are undetectable to the human ear. For example, when dying fish give off low-pitched infrasound, sharks hear it and head off to finish the job. This low-frequency buzz, often referred to as a “yummy hum,” is a useful hunting tool for predatory sharks, according to the Discovery Channel.

2. Swell sharks glow in the dark.  

19 Fun Facts About Sharks

Blue light doesn’t only come from screens. Nearly 1,700 feet beneath the ocean’s surface, you’ll find the swell shark to be another unlikely source of it. For reasons still unclear to scientists, these sharks emit a fluorescent glow that’s only visible to other swell sharks. Scientists themselves have only been able to detect the glow using filters that block out yellow light. According to biologist David Gruber of the City University of New York, these creatures glow so they can communicate with their other swell shark pals.

3. Ghost sharks have sex organs on their heads.  

19 Fun Facts About Sharks

These deep-sea creatures, also called chimera and ratfish, are mysterious, and not just because they lurk in the depths of the ocean. Among their most curious features is the male ghost shark’s sex organ, which protrudes from its head and attaches to the female’s pelvis during copulation, according to National Geographic. Female ghost sharks can hold onto this sperm and use it when they desire, sometimes up to three years later.

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4. Sharks’ only bones are their teeth.  

19 Fun Facts About Sharks

Sharks have been on this planet for hundreds of millions of years, yet fossils show little record of their existence. That’s because they’re elasmobranches, or species that have cartilage instead of bones, meaning most shark carcasses decompose before a fossil has time to form. Other elasmobranches include rays, skates, and sawfish. The only bones you’ll find in a shark’s body are its teeth, which it has plenty of!

5. Sharks can’t get cavities.  

19 Fun Facts About Sharks

Imagine eating whatever you wanted and never getting a cavity. That’s the reality for makos and tiger sharks, whose teeth are naturally coated in fluoride, according to 2012 research published in the Journal of Structural Biology. All the better for maintaining strong, healthy teeth that can bite into all kinds of flesh.

6. Sharks can go through up to 50,000 teeth in their lifetime.

19 Fun Facts About Sharks

Unlike human teeth, shark teeth don’t have roots, making them liable to fall out. Considering that some species may have as many as 300 teeth in their mouth at a time, that’s quite a lot of tooth loss. In fact, some sharks may only have a tooth for about a week before losing it.

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7. And they can grow them back pretty much overnight.  

19 Fun Facts About Sharks

Sharks are growing new teeth all the time, too. In fact, many sharks are able to replace a lost tooth in a matter of days or months. As long as the shark stays healthy, it will continue to be able to grow unlimited new teeth for the rest of its life.

8. Frilled sharks have 25 rows of teeth.  

19 Fun Facts About Sharks

The frilled shark is the stuff of nightmares, and not just because it looks like a beady-eyed eel. This deep-dwelling species of shark also has 25 rows of razor-sharp teeth. Their 300 triangular teeth are good for locking down on their slippery prey⁠—cephalopods, including octopus, cuttlefish, and squid. Because these sharks belong to a primitive species that has hardly evolved over millions of years, they’re sometimes referred to as “living fossils.”

9. Greenland sharks are the only sharks that can stand the Arctic cold.

Greenland sharks are unique for many reasons, one of which is that they are the only species of shark that can survive in Arctic temperatures, according to Fisheries and Oceans Canada. These sharks mostly live in polar regions in the North Atlantic Ocean but have also been sighted at extreme depths of lower latitude oceans.

As long as the water is chilly enough, the Greenland shark is happy. In the winter, they may come up to the surface, but by the time summer comes again, they make their home as deep as 2,400 feet below sea level.

10. And they can live up to 400 years.

Living in arctic conditions affects the Greenland shark in a number of remarkable ways. For one, they move incredibly slow, at an average speed of fewer than one mile per hour. But their movement isn’t the only thing slow about them; they also grow slowly. Adult Greenland sharks may reach up to 16 feet, but will only grow about one centimeter each year. At that rate, it takes about 150 years for a female Greenland shark to reach maturity. With such a slow growth rate, it’s only natural that these sharks would have exceptional longevity, often living up to 400 years.

11. Unborn sharks can protect themselves from predators.  

19 Fun Facts About Sharks

Oviparous sharks are sharks that lay eggs rather than carrying the embryo until birth. In these species, mothers have a very limited role in pregnancy. As soon as they lay their eggs, they swim away forever, leaving the embryos to fend for themselves. And that’s exactly what they do. When danger is afoot or a predator is nearby, shark embryos naturally freeze in their eggs to protect themselves. Researchers believe that this response is a sign that their electroreceptors develop at a very early stage.

12. Sharks carry their pups for up to two years.  

19 Fun Facts About Sharks

Not all sharks carry their pups through gestation, but the ones that do hold on to them for a long time. In many cases, they may carry their pups for up to two years, such as in the case of the spiny dogfish shark. In the end, that bonding time means little to shark mothers, who disappear right after a pup is born, similar to egg-laying sharks.

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13. Baby sharks swim away from their mothers after birth to avoid being eaten by them.  

19 Fun Facts About Sharks

Baby sharks, called pups, are independent creatures from the moment they are born, complete with predatory and defensive instincts. One of their first instincts is to swim away from their mothers as soon as they are born. This is to protect themselves from being eaten, which may very well happen considering some mother sharks stop eating before giving birth, working up a hefty appetite. Even if they have evaded their hungry moms, they’ll have many more predators to outmaneuver before they’re fully grown.

14. Some shark pups eat each other in the womb.  

19 Fun Facts About Sharks

It’s a pup eat pup world in the womb of a shark, where embryos cannibalize each other regularly. This is common in many shark species, but most notably in sand tiger sharks (that’s one of them, above). In a litter of up to eight pups, only one will be born. By that time, the strongest pup has eaten the others and is quite large at birth as a result. Because many litters include embryos from various fathers, some scientists believe that in utero cannibalization is a result of a paternity struggle.

15. Whale sharks can carry as many as 300 pups.  

19 Fun Facts About Sharks

In 1995, a Taiwan fishery caught a pregnant whale shark. When she finally gave birth, they were surprised to find that she was carrying more than 300 pups. This particular shark was relatively small as far as whale sharks go, which suggests that whale sharks may even be able to carry more pups than that. Whale sharks’ reproduction remains widely mysterious and scientists are still unsure whether this was a normal or a remarkable instance.

16. Male blue sharks get violent when mating.  

19 Fun Facts About Sharks

Male blue sharks literally bite into female sharks between their two dorsal fins in order to keep them still during sex. As you can imagine, this is hardly pleasant for the females. Thankfully, their skin is much thicker than the male’s, specifically to prevent too much damage during mating. Between nine and 12 months later, a female blue shark will give birth to between 20 and 50 pups.

17. But some sharks don’t need males to breed.  

19 Fun Facts About Sharks

It doesn’t happen very often, but scientists have been documenting more and more virgin births among sharks, especially those in captivity. One recent example comes from the Reef HQ Aquarium of Townsville, Australia, where Leonie the tiger shark gave birth to three pups without any sperm from a male shark. Asexual reproduction, called parthenogenesis, also occurs in Komodo dragons, wild pit vipers, chickens, and turkeys.

18. Thresher sharks kill with their tails.  

19 Fun Facts About Sharks

When it comes to thresher sharks, you need to look out for more than just their bite—their tails are just as dangerous. This doubly deadly animal has learned to take advantage of its large, muscular rear as a way to maim its prey. Just one whip of the thresher shark’s tail and dinner is served. Once the tail whip has killed its prey, the shark just scoops it right into its mouth.

19. Sharks only eat about two percent of their body weight.  

19 Fun Facts About Sharks

Sharks may be skilled killers, but that doesn’t mean they’re constantly killing. In fact, sharks may go entire months without eating and tend to feed only when they need more energy. Because they’re cold-blooded animals, they burn energy slowly and only need to refuel when the oil in their liver gets low.

20. And they don’t chew their food.

19 Fun Facts About Sharks

Sharks don’t even chew their food; they swallow it whole. Those scary teeth are just used to trap and maim their prey.

Watch next: How To Survive a Shark Attack

Source: https://bestlifeonline.com/amazing-shark-facts/

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