Whale vs Shark for Kids
Whales and sharks may share the same oceans and streamlined shapes, but they belong to completely different animal groups. Whales are warm-blooded mammals that breathe air, nurse calves with milk, and move horizontal tail flukes up and down. Sharks are cartilaginous fish that breathe through gills and sweep their tails from side to side.
Whale
- Type: Mammal
- Group: Cetacean
- Known for: Enormous size, breathing air, ocean migration, songs, diving, and powerful tail flukes
- Diet: Carnivore
- Special skill: Deep diving, long migrations, echolocation in toothed whales, or filter feeding in baleen whales
Shark
- Type: Fish
- Group: Cartilaginous Fish
- Known for: Cartilage skeleton, gills, replaceable teeth, strong senses, and streamlined swimming
- Diet: Carnivore
- Special skill: Detecting faint electrical signals and replacing worn or lost teeth
Quick Answer
Quick answer: A whale is a mammal with lungs, warm blood, a blowhole, and a baby called a calf. A shark is a fish with gills, a cartilage skeleton, and a baby called a pup. Whale tails move mainly up and down, while shark tails move mainly from side to side.
Whale vs Shark: Quick Comparison
| Feature | Whale | Shark |
|---|---|---|
| Animal type | Mammal | Fish |
| Animal group | Cetacean | Cartilaginous fish |
| Known for | Huge size, air breathing, migrations, songs, and diving | Gills, cartilage, replaceable teeth, and powerful senses |
| Main habitat | Oceans, coasts, polar seas, tropical seas, and some rivers | Oceans, reefs, coasts, deep water, and a few fresh waters |
| Where found | Worldwide waters | Worldwide waters |
| Diet | Krill, plankton, fish, squid, or marine mammals, depending on species | Fish, squid, crustaceans, plankton, or other animals, depending on species |
| Baby name | Calf | Pup |
| Breathing | Lungs and blowholes | Gills |
| Skeleton | Bone | Cartilage |
| Tail movement | Horizontal flukes move up and down | Vertical tail sweeps side to side |
How Are Whales and Sharks Alike?
- Both whales and sharks are backboned animals adapted to life in water.
- Both have streamlined bodies, fins or flippers, and powerful tails.
- Both include species ranging from relatively small animals to ocean giants.
- Both use excellent senses to find food and navigate through the sea.
- Both play important roles in marine food webs.
How Are Whales and Sharks Different?
- Whales are mammals, while sharks are fish.
- Whales breathe air through blowholes, while sharks take oxygen from water through gills.
- Whales have skeletons made of bone, while shark skeletons are made of cartilage.
- Whale mothers feed calves with milk, while shark pups do not drink milk.
- Whale tail flukes move mainly up and down, while shark tails sweep mainly from side to side.
Whale vs Shark Showdown
Ocean showdown: The whale wins for maximum size and total body strength because the blue whale is the largest animal known to have lived. The shark takes stealth and our weirdest-fact prize with electrical sensing, tooth-like skin, and a skeleton made of cartilage. Speed, social life, and swimming are ties because both groups contain very different species built for different ocean jobs.
Fun Whale vs Shark Facts
Mammal vs Fish
A whale is a mammal, so it is warm-blooded, breathes air, gives birth to live young, and feeds its calf with milk. A shark is a cartilaginous fish with gills, fins, and a skeleton made mostly of cartilage.
Lungs vs Gills
Whales must surface to breathe air through one or two blowholes connected to lungs. Sharks pass water over gills, which remove dissolved oxygen, so most do not need to surface for a breath.
Up-and-Down vs Side-to-Side Tails
A whale has horizontal tail flukes that push up and down. A shark has a vertical tail fin that sweeps from side to side, making tail shape and movement useful identification clues.
Bone vs Cartilage
Whale skeletons contain bone, like the skeletons of other mammals. Shark skeletons are made mostly of cartilage, the firm but flexible material also found in a human nose and ears.
Shark Skin Has Tiny Tooth-Like Scales
A shark’s skin is covered with dermal denticles, tiny hard structures shaped somewhat like teeth. They protect the body and can reduce drag as water flows over the shark.
Whale vs Shark Quiz
- Which animal is a mammal? Answer: Whale.
- Which animal breathes with gills? Answer: Shark.
- What is a baby whale called? Answer: A calf.
- What is a baby shark called? Answer: A pup.
- Which animal has a skeleton made mostly of cartilage? Answer: Shark.
Whale vs Shark FAQ
What is the main difference between a whale and a shark?
A whale is an air-breathing mammal with lungs and milk-producing mothers. A shark is a fish that breathes through gills and has a cartilage skeleton.
Which is bigger, a whale or a shark?
The largest whale, the blue whale, is much larger than the largest shark, the whale shark. Exact sizes vary enormously among species.
Is a whale shark a whale or a shark?
A whale shark is a shark and therefore a fish. Its name refers to its enormous size and filter-feeding lifestyle.
Do all sharks have sharp hunting teeth?
No. Teeth vary by diet. Whale sharks and basking sharks filter tiny food from water, while many other sharks use sharper teeth to catch larger prey.
Can whales and sharks breathe underwater?
Sharks use gills to take oxygen from water. Whales cannot breathe underwater and must surface to breathe air through blowholes.
Animal Words to Know
- Cetacean: A member of the mammal group containing whales, dolphins, and porpoises.
- Cartilage: Strong, flexible tissue that forms a shark’s skeleton.
- Gill: An organ that takes dissolved oxygen from water.
- Blowhole: A whale’s breathing opening on top of its head.
- Dermal denticle: A tiny tooth-like scale covering shark skin.
Whale and Shark Ocean Detective Activity
Whale and Shark Ocean Detective Activity
Draw a whale on one side with a blowhole, flippers, horizontal tail flukes, and a calf. Draw a shark on the other side with gill slits, fins, a vertical tail, and a pup. Add arrows showing up-and-down whale movement and side-to-side shark movement, then label lungs, gills, bone, cartilage, calf, and pup.
Meet Each Animal
Want the full fact file? Here are quick highlights from each animal’s own facts page.
Whale Fact Highlight
From the full animal facts pageShark Fact Highlight
From the full animal facts pageMore Animal Comparisons
Pick another animal matchup and keep exploring. Tiny facts, big questions, very serious animal business.
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