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Learn about sharks, a group of cartilaginous fish with diverse shapes, sizes and behaviors. Find out how sharks evolved, what they look like, how they sense, and how they interact with humans and other species.
Sharks can rouse fear and awe like no other creature in the sea. Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some sp...
- 5 min
- 8,6M
- National Geographic
- Anatomy
- Behavior
- Attacks
- Threats
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Like rays and skates, sharks fall into a subclass of fish called elasmobranchii. Species in this subclass have skeletons made from cartilage, not bone, and have five to seven gill slits on each side of their heads (most other fish have only one gill slit on each side), which they use to filter oxygen from the water. Whale sharks, the largest fish s...
Sharks are found in deep and shallow waters throughout the world’s oceans, with some migrating vast distances to breed and feed. Some species are solitary, while others hang out in groups to varying degrees. Lemon sharks, for example, have been foundto congregate in groups to socialize. Scientists are still trying to figure out how long sharks live...
People aren’t on a shark’s menu. Even though shark attacks have increased at a steady ratesince 1900—a result of better recording of attacks and a rising human population—they are still exceedingly rare: A beachgoer has only a one in 11.5 million chance of being bitten. Sharks bite people out of curiosity, to defend themselves from a perceived thre...
Sharks may not be a significant threat to us, but we are to them. Humans are responsible for drastic declines in shark populations. Overfishing is the biggest threat. An estimated 100 million sharks are killed each year, mostly to supply demand for an expensive Chinese dish called shark fin soup. Some fisheries allow the catch of whole sharks, like...
Learn about the world's biggest and fastest sharks, how they reproduce, and why some species are at risk of extinction. Find out the truth about shark attacks, how sharks live and hunt, and how humans impact their populations.
- 5 min
Learn about sharks, their diversity, importance and threats from overfishing, demand for fins and bycatch. Find out what WWF is doing to protect sharks and rays and how you can help.
30 août 2007 · Great white sharks leap out of the water in pursuit of their favorite food - seals. Subscribe: http://bit.ly/NatGeoSubscribe#NationalGeographic #GreatWhiteS...
- 3 min
- 4,1M
- National Geographic