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How is a shark different from other kinds of fish? by Holly Hartman Related Links Sharks Myths and StatsSharks Hall of FameSharks are fish. But how is a shark different from other kinds of fish? Most other fish have skeletons made of bone. A shark’s skeleton is made of cartilage, a type of strong but flexible tissue. Most other fish are covered in smooth, flat scales. A shark is covered in sharp, toothlike scales called denticles. Most other fish have just one gill slit—an organ for breathing—on each side of the body. A shark has five, six, or even seven gill slits on each side. Most other fish have flaps over their gills. Sharks do not. Shark Hearing Sharks have extremely sensitive hearing. They can identify much lower sounds than human ears can detect, and some can hear sounds more than 700 feet away. Some scientists think hearing is typically the first sense sharks use in detecting their prey. Shark Smelling Smell, however, could be the most remarkable of the sharks’ senses. Some sharks may be able to track their prey by smell from up to a mile away, probably by following a trail of microscopic particles of protein or blood. Shark Babies Different sharks have their babies, or “pups,” in different ways. Some lay egg cases. Others grow the pups inside of them and give birth to live young. Depending on the species, a shark may give birth to one or to dozens of pups! However it is born, a pup is on its own from the start—the mother shark doesn’t stay around to take care of it. Shark Evolution Scientists think that ancestors of sharks lived more than 400 million years ago—about 200 million years before dinosaurs. The main types of sharks living today evolved by 100 million years ago. Shark Teeth Most sharks have at least four rows of teeth. They don’t chew—they use their powerful teeth to bite and tear their food. As the first row of teeth in a shark gets worn out, the other rows of teeth move forward. New teeth are always forming. Shark Predators Sharks rarely pose a danger to humans. But humans do pose a danger to sharks! Fishermen kill an estimated 30 million to 100 million sharks every year. About 75 shark species are in danger of becoming extinct. Visit the Shark Hall of Fame
.com/spot/sharks2.html
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How is a shark different from other kinds of fish?
Sharks are fish. But how is a shark different from other kinds of fish?
- Most other fish have skeletons made of bone. A shark’s skeleton is made of cartilage, a type of strong but flexible tissue. Most other fish are covered in smooth, flat scales. A shark is covered in sharp, toothlike scales called denticles. Most other fish have just one gill slit—an organ for breathing—on each side of the body. A shark has five, six, or even seven gill slits on each side. Most other fish have flaps over their gills. Sharks do not.
Shark Hearing
Sharks have extremely sensitive hearing. They can identify much lower sounds than human ears can detect, and some can hear sounds more than 700 feet away. Some scientists think hearing is typically the first sense sharks use in detecting their prey.
Related Links
- Sharks Myths and StatsSharks Hall of Fame
Shark Smelling
Smell, however, could be the most remarkable of the sharks’ senses. Some sharks may be able to track their prey by smell from up to a mile away, probably by following a trail of microscopic particles of protein or blood.
Shark Babies
Different sharks have their babies, or “pups,” in different ways. Some lay egg cases. Others grow the pups inside of them and give birth to live young. Depending on the species, a shark may give birth to one or to dozens of pups! However it is born, a pup is on its own from the start—the mother shark doesn’t stay around to take care of it.
Shark Evolution
Scientists think that ancestors of sharks lived more than 400 million years ago—about 200 million years before dinosaurs. The main types of sharks living today evolved by 100 million years ago.
Shark Teeth
Most sharks have at least four rows of teeth. They don’t chew—they use their powerful teeth to bite and tear their food. As the first row of teeth in a shark gets worn out, the other rows of teeth move forward. New teeth are always forming.
Shark Predators
Sharks rarely pose a danger to humans. But humans do pose a danger to sharks! Fishermen kill an estimated 30 million to 100 million sharks every year. About 75 shark species are in danger of becoming extinct.
Visit the Shark Hall of Fame
.com/spot/sharks2.html
Sources +
Our Common Sources
Our Common Sources
Sharks!
- Sharks!
TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
- Did Birds Evolve from Dinosaurs?
- The Twelve Dancing Princesses
- Current Events This Week: January 2023
- African Americans by the Numbers
- Andersen’s Fairy Tales: Contents
- The Celtic Twilight: A Teller of Tales
