sharks
23 questions tagged sharks — spanning every one of the seven Ws.
How Do Sharks Sense Electricity?
Sharks detect the tiny electric fields made by living animals using jelly-filled pores on their snouts called ampullae of Lorenzini.
Why do some sharks need to keep swimming to breathe?
Some sharks rely on ram ventilation, meaning they must swim with their mouths open to force water over their gills. Others can pump water while resting, so they do not need constant motion.
Why do sharks have so many different shapes and sizes?
Sharks have diversified to fill many marine niches, from small bottom-dwellers to huge filter feeders. Their body shape reflects what they eat, where they live, and how they hunt.
Why do sharks need to keep swimming?
Many sharks need forward motion so water flows over their gills and keeps them oxygenated. Some species can rest on the seafloor because they can actively pump water across their gills.
Why do whale sharks filter-feed instead of hunt like other sharks?
Whale sharks feed on plankton and small animals because they are enormous, slow-moving filter feeders. Their wide mouths and filtering structures let them collect huge amounts of tiny prey.
Where is the Great White Shark most commonly found?
Great white sharks live in coastal and offshore waters in many parts of the world, especially temperate seas. They are common around South Africa, Australia, California, and the Mediterranean.
Why do some sharks have to keep swimming to breathe?
Some sharks rely on ram ventilation, meaning they must swim to push water over their gills. Others can pump water while resting, so breathing ability depends on the species.
Why do some sharks have rows of replaceable teeth?
Shark teeth are designed to be replaced continuously because they are easily damaged while feeding. New teeth move forward from rows behind the front set throughout life.
Why do whale sharks have such tiny teeth?
Whale sharks feed mostly by filtering plankton and small organisms, so they do not need large cutting teeth. Their enormous mouths and gill filters do most of the feeding work.
What is a goblin shark?
A goblin shark is a rare deep-sea shark with a long snout and a jaw that can shoot forward to catch prey. It is sometimes called a living fossil because it belongs to an ancient shark lineage.
What is a frilled shark?
A frilled shark is an eel-like deep-sea shark with frilly gill slits and a very long body. It is another ancient shark species that changes little compared with its fossil relatives.
What is a hammerhead shark?
A hammerhead shark is a shark with a flattened, hammer-shaped head called a cephalofoil. The shape helps with sensing prey and maneuvering.
What is a nurse shark?
A nurse shark is a slow-moving bottom-dwelling shark that often rests during the day. It is generally not aggressive and is known for suction-feeding on small prey.
When was the frilled shark first scientifically described?
It was first described in 1884 by German ichthyologist Ludwig Doderlein.
When was the goblin shark first scientifically described?
The goblin shark was first described in 1898.
When was the megamouth shark first discovered?
The megamouth shark was first identified in 1976.
Which shark is the largest in the ocean?
The whale shark is the largest shark species, reaching about 18 meters in length and weighing up to around 20 tonnes.
Which shark is the largest living fish?
The whale shark is the largest living fish, and the biggest individuals can reach around 18 meters in length.
Which shark has the widest known geographic range?
The whale shark has one of the widest distributions of any fish, occurring in tropical and warm-temperate oceans around the world.
Which shark can reproduce without a male?
Female hammerheads, blacktip sharks and some other sharks have been documented reproducing by parthenogenesis, though it is rare.
Which sea creature has the longest known lifespan among fish?
The Greenland shark is the longest-lived known vertebrate, with some individuals estimated to be more than 400 years old.
How do sharks sense tiny electrical signals from prey?
Many sharks detect weak bioelectric fields using special pores called ampullae of Lorenzini. These sensors can help them find hidden prey in sand or murky water.
How do whale sharks feed without hunting large prey?
Whale sharks are filter feeders that swim with open mouths to strain plankton, small fish, and other tiny organisms. They can filter vast amounts of water while cruising slowly.