![](https://i.imgur.com/CLvY2jA.png")
27-07-2022, 08:46 AM
By Rachel Fadem, CNN
Updated 1848 GMT (0248 HKT) July 26, 2022
Sharks have scared us a lot this summer, primarily for suspected attacks on humans. However, humans are a larger threat to sharks than sharks are to us.
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There are more than 500 species of shark. They are as diverse as the dwarf lantern shark, which is smaller than a human hand, and the whale shark, which can grow as long as a school bus
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Sharks have been around for hundreds of millions of years, and while they continue to evolve, they are also in grave danger. Largely due to overfishing, shark and ray populations fell by 71.1% between 1970 and 2018
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Greenland sharks are the longest-living known vertebrate on Earth
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the North Atlantic species likely lives an average of at least 272 years, and often doesn't reach maturity until 150 years of age.
Greenland sharks can live for at least 400 years
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The earliest evidence of shark fossils dates back as far as 450 million years, which means these creatures have been around at least 90 million years before trees and 190 million years before dinosaurs.
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sharks have survived five mass extinctions, one of which wiped out around 96% of all marine life.
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Tiger sharks, one of Australia's primary predators, may help ecosystems respond to extreme climate events. The species' prey, including green turtles, seabirds and stingrays, avoid shallow water, often areas with seagrass. As a result, the seagrass is able to grow to be bushlike and create a safe-haven nursery area for juvenile fish, shrimp and crabs
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Seagrass absorbs the carbon that is in the atmosphere and uses it to build its body. When the seagrass dies, the dead material gets buried in sediment on the ocean floor, and the carbon is taken out of circulation
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"It seems like it's more than just tiger sharks," Heithaus said. "It's probably these bigger species that play an outsized role in helping shape the ecosystems they're a part of."
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On average, sharks give birth after 11 or 12 months of pregnancy, but some sharks, such as the frilled shark and basking shark can be pregnant for over three years.
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Sharks are primarily silent creatures, as they don't have organs for producing sound.
Instead of speaking, sharks communicate through body language, such as zigzagging, shaking and moving their jaws.
......
Sharks have a sixth sense -- they can pick up nanoscopic electromagnetic currents. This extra sense can help them navigate the ocean and find prey, or even a mate.
https://edition.cnn.com/2022/07/26/world...index.html
Updated 1848 GMT (0248 HKT) July 26, 2022
Sharks have scared us a lot this summer, primarily for suspected attacks on humans. However, humans are a larger threat to sharks than sharks are to us.
......
There are more than 500 species of shark. They are as diverse as the dwarf lantern shark, which is smaller than a human hand, and the whale shark, which can grow as long as a school bus
......
Sharks have been around for hundreds of millions of years, and while they continue to evolve, they are also in grave danger. Largely due to overfishing, shark and ray populations fell by 71.1% between 1970 and 2018
......
Greenland sharks are the longest-living known vertebrate on Earth
......
the North Atlantic species likely lives an average of at least 272 years, and often doesn't reach maturity until 150 years of age.
Greenland sharks can live for at least 400 years
......
The earliest evidence of shark fossils dates back as far as 450 million years, which means these creatures have been around at least 90 million years before trees and 190 million years before dinosaurs.
......
sharks have survived five mass extinctions, one of which wiped out around 96% of all marine life.
......
Tiger sharks, one of Australia's primary predators, may help ecosystems respond to extreme climate events. The species' prey, including green turtles, seabirds and stingrays, avoid shallow water, often areas with seagrass. As a result, the seagrass is able to grow to be bushlike and create a safe-haven nursery area for juvenile fish, shrimp and crabs
......
Seagrass absorbs the carbon that is in the atmosphere and uses it to build its body. When the seagrass dies, the dead material gets buried in sediment on the ocean floor, and the carbon is taken out of circulation
......
"It seems like it's more than just tiger sharks," Heithaus said. "It's probably these bigger species that play an outsized role in helping shape the ecosystems they're a part of."
......
On average, sharks give birth after 11 or 12 months of pregnancy, but some sharks, such as the frilled shark and basking shark can be pregnant for over three years.
......
Sharks are primarily silent creatures, as they don't have organs for producing sound.
Instead of speaking, sharks communicate through body language, such as zigzagging, shaking and moving their jaws.
......
Sharks have a sixth sense -- they can pick up nanoscopic electromagnetic currents. This extra sense can help them navigate the ocean and find prey, or even a mate.
https://edition.cnn.com/2022/07/26/world...index.html
