Is shark a mammal - 7. Greenland sharks are blind. Most of the rare fish in the sea are born blind. This is because they tend to live in the depths of the ocean where there’s not enough light to see anyway. However, this isn’t the case for the Greenland shark. You see, the other rare fish are born blind. The Greenland shark becomes blind.

 
SHARK DISTRIBUTIONS OFF THE. NORTHEAST UNITED STATES FROM. MARINE MAMMAL SURVEYS.-From Oct. 1978 throughJan. 1982, the Cetacean and Tur- tle Assessment .... Best family beaches in nj

Blue sharks are named for the striking blue coloratio n on their backs, making them the most distinctive of the requiem sharks. The contrast between their white underbelly and dark blue back is called counter-shading and helps provide ca mouflage for the shark as it swims in the open ocean. The blue shark is one of the most wide-ranging shark spe cies, and can …Jaw and teeth. The mouth of the stingray is located on the ventral side of the vertebrate. Stingrays exhibit hyostylic jaw suspension, which means that the mandibular arch is only suspended by an articulation with the hyomandibula.This type of suspensions allows for the upper jaw to have high mobility and protrude outward. The teeth are modified placoid …Oct 12, 2022 · Shark. Read Time: 7 Minute, 5 Second. Sharks are fish, not mammals. Sharks do not produce milk and lack features found in mammals like hair and lungs. Sharks have scales, and fins, and use gills to breathe because they are fish. Mammals belong to the class Mammalia, whereas sharks are members of the class Chondrichthyes. Discover the most interesting facts about sharks, including where they live, what they eat, how they sleep, if they have bones, and how to protect them.These mammals all have lungs and must surface to breathe air. In stark contrast, sharks are not mammals; they are fish. Operating as cold-blooded entities, sharks breathe through their gills, extracting oxygen from water, while whales, dolphins, and porpoises breathe air through their lungs.Oct 12, 2022 · Shark. Read Time: 7 Minute, 5 Second. Sharks are fish, not mammals. Sharks do not produce milk and lack features found in mammals like hair and lungs. Sharks have scales, and fins, and use gills to breathe because they are fish. Mammals belong to the class Mammalia, whereas sharks are members of the class Chondrichthyes. The basking shark ( Cetorhinus maximus) is an enormous plankton-eating shark. After the whale shark, it is the second-largest living shark. The shark takes its common name from its habit of feeding near the sea surface, making it appear to bask in the sun. Although its large size may seem threatening, the basking shark is not …Feb 16, 2024 ... The hippopotamus (Hippopotamus amphibious) is said to have the strongest bite of all land animals at about 8,130 Newtons per square inch. They ...Sharks are fish. Some people mistake sharks for mammals because they share certain physical traits. But like other fish, sharks are cold-blooded, breath through gills, and their bodies are covered in denticles (tooth-like scales). Sharks are also missing several key mammalian traits: They don’t grow hair, produce milk, or have a neocortex ...Baby sharks, appropriately called “pups,” eat smaller quantities of the same food that adult sharks eat. Although the exact composition of the diet will vary due to species, enviro...Jan 27, 2019 · Whales are a member of the cetacean family, and as such, despite being wholly water-resident, whales are mammals, not fish.There are only 83 species of cetaceans in the world organized into 14 families and two main subcategories: Toothed whales (Odontoceti, including killer whales, narwhals, dolphins, and porpoises) and baleen whales (Mysticeti, humpback whales, and rorquals). The whale shark (Rhincodon typus) is the largest living fish species, but grows to only about two-thirds the length and a quarter of the weight of a blue whale. - Credit: Steve AM. The largest living mammal species in …Dec 5, 2023 · Whales, dolphins, and porpoises share a common classification as mammals. These marine creatures are warm-blooded, give birth to live young, and nurse their offspring with milk. These mammals all have lungs and must surface to breathe air. In stark contrast, sharks are not mammals; they are fish. Dugong. The dugong ( / ˈd ( j) uːɡɒŋ /; Dugong dugon) is a marine mammal. It is one of four living species of the order Sirenia, which also includes three species of manatees. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow ( Hydrodamalis gigas ), was hunted to ...Airbnb is giving away a night in the French Aquarium de Paris where you can literally sleep with sharks. By clicking "TRY IT", I agree to receive newsletters and promotions from Mo...Shark teeth likely evolved from the jagged scales that cover their skin. Some species of sharks and rays are suspension feeders that feed on plankton. ... Mammals are endothermic, and hair provides insulation by trapping a layer of air close to the body to retain metabolic heat. Hair also serves as a sensory mechanism through specialized hairs ...Bull sharks can grow to almost 12 feet long and can weigh up to 500 pounds. They have rounded heads, small eyes and grey bodies with paler grey stomachs. Their name comes from their short, blunt snout and their habit of head-butting prey before they attack, kind of like a charging bull. And yes, they can be quite aggressive.Young great white sharks eat fish (including other sharks) and rays. As they grow, the sharks’ favorite prey becomes sea mammals, especially sea lions and seals. Sharks count on the element of surprise as they hunt. When they see a seal at the surface of the water, sharks will often position themselves underneath the seal.There are several hundred species of sharks, ranging in size from less than eight inches to over 65 feet. Learn more about sharks with these facts. ... Sharks are carnivores, and they primarily hunt and eat fish, sea mammals like dolphins and seals, and other sharks. Some species prefer or include turtles and seagulls, crustaceans and …Sharks are fish, not mammals, but sharks do have a unique egg-laying feature. These cartilaginous fish are ovoviviparous. Sharks lay eggs inside their bodies. A common question is whether the eggs hatch inside a shark's body. Well, the answer is a big yes. Eggs hatch into young babies that remain inside the mother shark.Sharks have long held a fascination for humans, sparking numerous questions about their biology and behavior. One commonly asked question is whether sharks are fish or mammals. The answer is simple: sharks are fish. Specifically, they belong to the class of cartilaginous fish, which includes manta rays and sting rays. The differences between sharks and mammals are vast. In addition to lacking a bony skeleton, there are several other distinguishing features that separate these two groups of animals. For one, sharks live their entire lives in the water while most mammals can breathe both on land and underwater. Sharks also lack sweat glands (which all mammals ... A shark can detect sound waves and disturbances in the water with its lateral line, or lateralis, system. This is a series of thin canals, filled with water, that runs along the animal’s side. The canals are attached to nerves that send signals to the shark’s brain. Sharks can also sense electric and magnetic fields.Shark Bites: Evogene Ltd. (EVGN) is a computational predictive biology stock play....EVGN Evogene Ltd. (EVGN) is a small Israeli company that is using something called computationa...Dec 21, 2023 · Sharks, with their sleek bodies and powerful presence in the oceans, are often a subject of fascination and curiosity. One common question that arises is whether sharks are mammals, fish, or amphibians. With a burst of energy, the shark swims toward the surface with its mouth open, its slim body twirling through the water like a ballerina. Score! The shark nabs a fish—but the show’s not over yet. The shark’s momentum pushes it up to 20 feet out of the water, rotating several times before splashing back down.A shark is not considered a mammal. Sharks are considered members of the paraphyletic group of organisms that contain gills, or in other words, fish. Sharks lack some of the defini...Which shark is a mammal? Le shark is a fish. Yes, despite its large size it doesthe not one mammal ! He does not carry his baby in his womb, he does not ...There are species of whales inhabiting all of the world’s oceans and even species of whales that inhabit deep-sea ecosystems. All whales have typical mammalian characteristics. Whales are eutherian, or placental, mammals that give birth to live offspring. They have mammary glands, lactate, and nurse their young.The jaws of a house cat are more lion- than wolf-like, for example. The teeth of horses and zebras look alike. The ear bones of mammals were once the jaws of prehistoric reptiles. And so on ...The bull shark has more teeth than any other vertebrate. It not only has about 350 teeth at any one time but replaces its teeth constantly throughout life and may go through as man...The vaquita is the world's rarest marine mammal—and is in dire need of our help. Vaquita are often caught and drowned in gillnets used by illegal fishing operations in marine protected areas within Mexico's Gulf of California. ... It supports an extraordinary diversity of marine life including sharks, whales, marine turtles, and many species ...sand tiger shark, any of three species of sharks classified in the genera Carcharias and Odontaspis in family Odontaspididae (order Lamniformes), named for their predatory habits and tendency to frequent inshore habitats in tropical and temperate oceans worldwide.. Distribution. The name sand tiger shark typically refers to C. taurus (and C. …Is a shark mammal? Sharks are fish, even though some people believe they are mammals due to how big some of them can get and because some give birth to live young. Fish are aquatic animals that were among the first vertebrates (animals with a backbone) to evolve on earth.The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. It is the only known surviving species of its genus Carcharodon.The great white shark is notable for its size, with the largest …The official mammal class is Mammalia. Types of animals that are mammals include warm-blooded vertebrates that have hair or fur and whose babies drink milk. Unlike other animal types like birds and insects, all mammal babies drink milk that comes from their mother’s bodies. This is one of the key ways to know if an animal is a mammal.Sharks rarely attack people and would much prefer to eat fish or marine mammals. Millions of people around the world use the oceans every year without incident.Shark. Read Time: 7 Minute, 5 Second. Sharks are fish, not mammals. Sharks do not produce milk and lack features found in mammals like hair and lungs. Sharks have scales, and fins, and use gills to breathe because they are fish. Mammals belong to the class Mammalia, whereas sharks are members of the class Chondrichthyes.Dolphin. A dolphin is an aquatic mammal within the infraorder Cetacea. Dolphin species belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins ), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).Cleaning your home has never been so easy thanks to all the Shark vacuums on the market. But with so many to choose from, how do you pick the right one? Get started with our compre...Discover the most interesting facts about sharks, including where they live, what they eat, how they sleep, if they have bones, and how to protect them.Mammals are a particular class of animal. What makes an animal a mammal are several things. First, they must have glands that give milk. This is to feed their babies. Second, they are warm-blooded. Third, all mammals have fur or hair. Humans are mammals and so are dogs, whales, elephants, and horses. Most mammals have teeth with the exception ...If you’re looking for a Shark vacuum cleaner that can handle all of your cleaning needs, look no further than the different types of vacuum cleaners available on the market. There’...I was on a walk with my son the other day. He asked me, “Hey Dad, if you could only pick one what would you choose: a sword, wand or... Edit Your Post Published by Jeff S...Sharks are not mammals, they are fish. In taxonomic terms there are two broad classes of fish. There's Osteichthyes or the bony fish, which includes fish species like goldfish, …The first difference between sharks and dolphins is the type of animal they are — sharks are fish while dolphins are mammals (like us). Dolphins, and other mammals, are warm blooded, give birth to live young, nurse their young, are born with hair, and breathe air. Sharks, like other fish, have gills to remove oxygen from the environment, are ...Long, white tusks break the surface of the icy Arctic water. It’s not a waterlogged herd of unicorns—it’s a pod of narwhals! This species of whale is best known for its tusk—a long, spiraled tooth that usually only the males develop. (Females occasionally do.) The tusk can grow to 9 feet (3 meters) long and weigh more than 22 pounds (10 kilograms). MYSTERY …Neither.Sharks are classified as a type of fish and are not mammals or amphibians. Like other fish, sharks breathe through gills for their entire...Whale sharks are not mammals at all. They are sharks and therefore fishes that are nicknamed as ‘whales’ due to how excessively large their body sizes can get compared to other fishes in the ocean. Whale sharks have been observed to rival the sizes of most species of whales including the humpback and killer whales.These sharks have dark, saddle-shaped splotches along the fins and upper body. Fish or mammal? Sharks are cartilaginous fish, which means that their skeletons are made entirely of cartilage (the same squishy material that is found in our human nose and ears). They are a lot more flexible than their "bony" fish cousins.Marine mammals are animals that are warm-blooded with back bones that live in water. This information can also be discovered by looking at marine mammal taxonomic classifications. These classifications allow people to better understand how marine mammals are related to other animals. The example below explains the taxonomy for …The finding makes whale sharks -- which have been reported up to 18m long -- the world's largest omnivore. "On land, all the biggest animals have always been herbivores," Dr Meekan said.Continue your reading. Read classic marine mammal books (e.g., Handbook of Marine Mammals, Cetacean Societies – Field Studies of Dolphins and Whales, Hawaiian Spinner Dolphin, Sperm Whales: Social Evolution in the Ocean, Dolphin Societies – Discoveries and Puzzles, The Bottlenose Dolphin, Marine Mammals – Evolutionary Biology, and many …The dugong (/ ˈ d (j) uː ɡ ɒ ŋ /; Dugong dugon) is a marine mammal.It is one of four living species of the order Sirenia, which also includes three species of manatees.It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.Shark teeth likely evolved from the jagged scales that cover their skin. Some species of sharks and rays are suspension feeders that feed on plankton. ... Mammals are endothermic, and hair provides insulation by trapping a layer of air close to the body to retain metabolic heat. Hair also serves as a sensory mechanism through specialized hairs ... AWSALB is an application load balancer cookie set by Amazon Web Services to map the session to the target. Used by Microsoft Advertising as a unique ID for visitors. Whales are not fish. They are marine mammals, as are dolphins and porpoises. They are warm-blooded and breathe air like humans. Jaw and teeth. The mouth of the stingray is located on the ventral side of the vertebrate. Stingrays exhibit hyostylic jaw suspension, which means that the mandibular arch is only suspended by an articulation with the hyomandibula.This type of suspensions allows for the upper jaw to have high mobility and protrude outward. The teeth are modified placoid …Some sharks that give birth to live young are viviparous: they give birth to live young which, during their development, receive nutrients from the mother in a manner similar to that seen in placental mammals. Asexual Reproduction In Sharks. There is evidence of female sharks producing offspring without a mate, via parthenogenesis. This is rare ... Sharks have long held a fascination for humans, sparking numerous questions about their biology and behavior. One commonly asked question is whether sharks are fish or mammals. The answer is simple: sharks are fish. Specifically, they belong to the class of cartilaginous fish, which includes manta rays and sting rays. There are several types of shark, some of which can attack people swimming. a fatal shark attack; The boat went down in shark-infested waters off the coast of South Africa. The dark shapes of half a dozen sharks circled beneath the boat. see also basking shark, great white shark Topics Fish and shellfish a2No, a shark is not a mammal. Despite names like ‘whale shark’, all sharks are fish and differ in many ways from mammals. For example, mammals breathe air through lungs, feed their …A shark can detect sound waves and disturbances in the water with its lateral line, or lateralis, system. This is a series of thin canals, filled with water, that runs along the animal’s side. The canals are attached to nerves that send signals to the shark’s brain. Sharks can also sense electric and magnetic fields.The first difference between sharks and dolphins is the type of animal they are — sharks are fish while dolphins are mammals (like us). Dolphins, and other mammals, are warm blooded, give birth to live young, nurse their young, are born with hair, and breathe air. Sharks, like other fish, have gills to remove oxygen from the environment, are ...Is a shark mammal? Sharks are fish, even though some people believe they are mammals due to how big some of them can get and because some give birth to live young. Fish are aquatic animals that were among the first vertebrates (animals with a backbone) to evolve on earth.Mar 6, 2023 · Sharks are usually 5.8 to 7 meters long – which is at least 3 times the height of the average human. While the smallest species are less than 20 centimeters long, the largest one is about 12 meters. Sharks usually have a body weight of around 1500 to 4000 pounds. However, some can also weigh about 5500 pounds. Moreover, humans and salmons are equally related to sharks, because the node separating bony fish from cartilaginous fish is also the node separating ...While mammals belong to class Mammalia, sharks belong to class Chondrichthyes. Even though sharks share some physical characteristics with some mammals, marine mammals like …Other marine mammals include seals, fur seals, sealions, dugongs, manatees, walruses, sea otters and even polar bears! What is a whale shark? A whale shark is a fish. It is the largest member of the shark family. Like many large whales it feeds on tiny creatures in the ocean such as plankton.The largest living mammal species in the world is the blue whale (Balaenoptera musculus), reaching some 33.5 m (110 ft) and weighing a staggering 150 tonnes.Mammals that Start with A; Find your favorite Animals! Search. Advertisement. WATCH: Sharks biting alligators, the most epic lion battles, and MUCH more. Enter your email in the box below to get the most mind-blowing animal stories and videos delivered directly to your inbox every day.Marine mammals are found in marine ecosystems around the globe. They are a diverse group of mammals with unique physical adaptations that allow them to thrive in the marine environment with extreme temperatures, depths, pressure, and darkness. Marine mammals are classified into four different taxonomic groups: cetaceans …May 22, 2021 · No, sharks are not mammals. All species of sharks are classified as fish. Sharks do not have mammary glands, and do not feed their young, so are therefore disqualified from being named mammals. Sharks use gills to breath with, as fish do, rather than lungs that exchange respiratory gases. The Dutch Caribbean is an important area for marine mammals, sharks and rays. More than twenty marine mam- mal and thirty shark and ray species.This means a shark's skeleton is made from cartilage, not bone as occurs in mammals. Cartilage is a tissue which is much less harder than bone and has greater flexibility. Skeletal structure is not the only different between sharks and aquatic mammals such as dolphins or whales. Mammals have mammary glands which produce milk to …No, a shark is not a mammal. Despite names like ‘whale shark’, all sharks are fish and differ in many ways from mammals. For example, mammals breathe air through lungs, feed their …Dugong. The dugong ( / ˈd ( j) uːɡɒŋ /; Dugong dugon) is a marine mammal. It is one of four living species of the order Sirenia, which also includes three species of manatees. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow ( Hydrodamalis gigas ), was hunted to ...Sharks belong to what vertebrate class? This page titled 12.6: Vertebrate Classification is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.A whale shark is a fish. It is the largest member of the shark family. Like many large whales it feeds on tiny creatures in the ocean such as plankton.Dec 3, 2020 · Sharks can lay eggs called “cases” or “purses.” These purses can be spiral-shaped or oval-shaped. While many sharks do lay eggs, the majority actually give live birth similar to a mammal. The babies stay inside the shark until they are ready to be birthed and then the shark births them, very similar to dolphins and whales. Sharks: A Unique Classification. Sharks are a unique classification of animal that shares traits with several different types of creatures. They are not fish, mammals, or reptiles, but rather a group of animals that have evolved their own distinct characteristics. Sharks have been around for over 400 million years, making them one of the oldest ...Detailed Solution · Whale belongs to the class Mammalia. · The whale is a mammal, not a fish, hence it is warm-blooded. · It is classified under the Phylum&nbs...Oct 12, 2022 · Shark. Read Time: 7 Minute, 5 Second. Sharks are fish, not mammals. Sharks do not produce milk and lack features found in mammals like hair and lungs. Sharks have scales, and fins, and use gills to breathe because they are fish. Mammals belong to the class Mammalia, whereas sharks are members of the class Chondrichthyes. Despite the name of a whale shark including the word ‘ whale ‘, which are mammals, a whale shark is in fact a fish. Whale sharks don’t have mammary glands to suckle their young and they are not warm blooded like mammals. They don’t have lungs like whales and dolphins have, but instead use gills to extract oxygen from the water.Is shark a fish or a mammal? Why? Shark are fished, because sharks is not a mammals they are not warm-blooded. 5. What is the most distinguishing characteristics of mammal? There are hair, …Sharks have a range of adaptations that make them perfectly suited to their environment. It's no wonder they've gained a reputation for being some of the most impressive and formidable predators on the planet! Shark Senses. Many shark species have brains as complex as mammals, which enables them to process a wide range of senses. AWSALB is an application load balancer cookie set by Amazon Web Services to map the session to the target. Used by Microsoft Advertising as a unique ID for visitors. Whales are not fish. They are marine mammals, as are dolphins and porpoises. They are warm-blooded and breathe air like humans. Airbnb is giving away a night in the French Aquarium de Paris where you can literally sleep with sharks. By clicking "TRY IT", I agree to receive newsletters and promotions from Mo...Shark AV2501S AI Ultra Robot Vacuum. Save on Shark's powerful robot vacuum with a HEPA filtration system that captures pet hair, dust mites, dander and allergens with …Moreover, humans and salmons are equally related to sharks, because the node separating bony fish from cartilaginous fish is also the node separating ...

sand tiger shark, any of three species of sharks classified in the genera Carcharias and Odontaspis in family Odontaspididae (order Lamniformes), named for their predatory habits and tendency to frequent inshore habitats in tropical and temperate oceans worldwide.. Distribution. The name sand tiger shark typically refers to C. taurus (and C. …. Can you put laminate over tile

is shark a mammal

Sharks: They are not mammals because they lack all of the characteristics that define mammals. They don't have warm blood, for example. Sharks are classified as fish, despite the fact that, unlike most fish, their skeleton is made of cartilage. Sharks eat smaller fish because they are carnivores. Sharks, on the other hand, are opportunistic ...The tiger shark is a large, predatory shark that is second only to the great white in attacks on humans. Tiger sharks are named for the vertical stripes seen on their bodies, which are more prominent when they are young. They are found in warm, tropical and subtropical waters worldwide.May 22, 2021 · No, sharks are not mammals. All species of sharks are classified as fish. Sharks do not have mammary glands, and do not feed their young, so are therefore disqualified from being named mammals. Sharks use gills to breath with, as fish do, rather than lungs that exchange respiratory gases. Sharks are a species of fish, they are not mammals. That species is cartilaginous fish, the same as manta rays and sting rays. Are all sharks fish? There are over 500 species of sharks …Discover the most interesting facts about sharks, including where they live, what they eat, how they sleep, if they have bones, and how to protect them.The bull shark has more teeth than any other vertebrate. It not only has about 350 teeth at any one time but replaces its teeth constantly throughout life and may go through as man...A shark is a cartilage marine animal that humans are afraid of. Chondrichthyes is the class referring to such fish. Sharks are great predators but are still fearful. You may be …Cetacean, any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises. Cetaceans are entirely carnivorous. Their ancestors moved their limbs in a vertical plane, and thus cetaceans use vertical strokes when they swim, instead of horizontal strokes like a crocodile or fish.The Dutch Caribbean is an important area for marine mammals, sharks and rays. More than twenty marine mam- mal and thirty shark and ray species.Whale sharks are not mammals at all. They are sharks and therefore fishes that are nicknamed as ‘whales’ due to how excessively large their body sizes can get compared to other fishes in the ocean. Whale sharks have been observed to rival the sizes of most species of whales including the humpback and killer whales.Ecology – The bite of a Bull Shark exerts more force than a similarly-sized White Shark, and this species feeds on other large marine animals like sharks (including cannibalism on other Bull Sharks), marine mammals such as seals and dolphins, sea turtles, and large fishes, occasionally taking prey nearly as large as themselves. Bull Sharks ...Sharks aren’t Mammals. You probably think sharks are mammals because they give birth to their offspring. Well, they aren’t because they don’t feed their offspring using mammary glands. They instead fall under …Shark habitats are as varied as sharks themselves. So the answer to the question “where do sharks live?” is simply: in water. Some shark species (such as the great white shark) prefer cooler waters, while others (like the whale shark) prefer warmer waters. Some sharks (like the bull shark) are even able to live in both saltwater and ...Fish Versus Mammals. Sharks are fish. They are vertebrates, meaning they have a rigid backbone. They are also very ancient beasts – this Class of aquatic animals has existed on the earth for more than 400 million years. They live in water and their bodies are covered in scales. To swim, they move their tails from side-to-side.Long, white tusks break the surface of the icy Arctic water. It’s not a waterlogged herd of unicorns—it’s a pod of narwhals! This species of whale is best known for its tusk—a long, spiraled tooth that usually only the males develop. (Females occasionally do.) The tusk can grow to 9 feet (3 meters) long and weigh more than 22 pounds (10 kilograms). MYSTERY …Most sharks have a body shape that is at least somewhat fusiform, or torpedo-like. As they swim, sharks use continuous lateral (side-to-side) undulations of the body. The pectoral fins on either side of the body are positioned and shaped to help the shark maneuver in all planes, often at “lightning” speed. The shark’s tail, or caudal fin ...May 22, 2021 · No, sharks are not mammals. All species of sharks are classified as fish. Sharks do not have mammary glands, and do not feed their young, so are therefore disqualified from being named mammals. Sharks use gills to breath with, as fish do, rather than lungs that exchange respiratory gases. whale shark, Species ( Rhincodon typus) of gigantic but harmless shark found worldwide but mainly in the tropics. The largest of living fishes, it often grows to about 30 ft (9 m) long and may reach twice that size. It is gray or brown with a pale undersurface and is distinctively marked with small spots and narrow vertical lines of yellow or ....

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