Q. What is the name of this sea creature?
Options: Octopus · Crab · Shark · Whale
Answer: Crab
It's a crab! Its leg joints only bend sideways, so it walks sideways, and it has to shed its hard shell to grow.
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Life beneath the waves — answers and explanations for all 100 questions. Cover the answer, have a guess first, then check the explanation. Want to play it as a quiz? Try it at the Quiz Playground!
Q. What is the name of this sea creature?
Options: Octopus · Crab · Shark · Whale
Answer: Crab
It's a crab! Its leg joints only bend sideways, so it walks sideways, and it has to shed its hard shell to grow.
Q. What is the name of this sea creature?
Options: Jellyfish · Octopus · Small octopus · Squid
Answer: Octopus
An octopus has 8 arms! A squid has 10.
Q. What is a jellyfish's body mostly made of?
Options: Fat · Bone · Water · Muscle
Answer: Water
About 95% of a jellyfish's body is water!
Q. What is the name of this sea creature?
Options: Tuna · Ocean sunfish · Pufferfish · Ray
Answer: Ocean sunfish
It's an ocean sunfish! This big, round, flat fish sometimes lies on the surface soaking up sun — that's how it got the name 'sunfish'.
Q. What is the name of this sea creature?
Options: Turtle · Whale · Squid · Shrimp
Answer: Whale
A 'whale' is a big animal that lives in the sea.
Q. What is the name of this sea creature?
Options: Mackerel · Whale · Shark · Squid
Answer: Shark
A 'shark' has sharp teeth.
🐙 Q. How many arms does an octopus have in all?
Options: 10 · 12 · 8 · 6
Answer: 8
An octopus has '8' arms.
🦐 Q. What do we call hard-shelled sea animals like shrimp and crabs?
Options: Crustaceans · Shellfish · Fish · Mammals
Answer: Crustaceans
The group with hard shells is called 'crustaceans'.
🐙 Q. What do an octopus and squid squirt as they escape danger?
Options: Bubbles · Paint · Ink · Fire
Answer: Ink
They squirt ink to block the view and escape.
🦈 Q. What happens to a shark's teeth?
Options: It has no teeth · It only ever has two · Once one falls out, that's it · New ones keep growing in
Answer: New ones keep growing in
A shark keeps growing new teeth as old ones fall out.
⭐ Q. What happens if a starfish's arm gets cut off?
Options: It changes color · It becomes two starfish · It dies · It grows back
Answer: It grows back
A starfish regrows an arm that's been cut off.
🦀 Q. How does a crab usually walk?
Options: Gliding · Only backward · Hopping · Sideways
Answer: Sideways
A crab walks sideways.
🐢 Q. Where does a sea turtle lay its eggs?
Options: Inside coral · On a sandy beach · On underwater rocks · On the water
Answer: On a sandy beach
A sea turtle lays its eggs on a sandy beach on land.
🐴 Q. Who carries the babies (eggs) in a pouch on a seahorse?
Options: The grandmother · No one does · The mother · The father
Answer: The father
A seahorse's babies grow in the father's pouch.
🐡 Q. What does a pufferfish do with its body in danger?
Options: Flattens out · Puffs up like a ball · Turns hard as stone · Becomes see-through
Answer: Puffs up like a ball
A pufferfish puffs up like a ball to scare enemies.
🐬 Q. Is a dolphin a fish or a mammal?
Options: A fish · A mammal · A reptile · An amphibian
Answer: A mammal
A dolphin is a mammal that feeds milk to its young.
🐋 Q. How does a whale breathe?
Options: It comes to the surface and uses its blowhole · With gills, nonstop · It drinks water through its nose · It doesn't breathe
Answer: It comes to the surface and uses its blowhole
A whale surfaces and breathes through the blowhole on its head.
🦑 Q. How many arms does a squid have in all?
Options: 6 · 8 · 10 · 4
Answer: 10
A squid has 10 (an octopus has 8).
🐚 Q. What does a clam use to protect its soft body?
Options: Ink · Spines · A hard shell · Fins
Answer: A hard shell
A clam protects itself with two hard shells.
🦪 Q. Where are pearls made?
Options: Inside a clam · Under rocks · Inside coral · Inside a fish's belly
Answer: Inside a clam
A pearl forms inside a clam.
🪸 Q. Is coral an animal or a plant?
Options: An animal · A plant
Answer: An animal
Coral is made of countless tiny animals living together.
🐟 Q. Which body part lets a fish breathe underwater?
Options: Nose · Fins · Lungs · Gills
Answer: Gills
A fish takes in oxygen from the water through its gills.
🐠 Q. Where does the clownfish, famous as Nemo, hide and live?
Options: On seaweed · Inside a clam · Under the sand · Inside a sea anemone
Answer: Inside a sea anemone
A clownfish lives hidden among a sea anemone's tentacles.
🦦 Q. What does a sea otter use to crack open hard clams?
Options: A rock · Ink · Its fins · Only its teeth
Answer: A rock
A sea otter puts a rock on its belly and cracks clams on it.
🐙 Q. What can an octopus do with its body color?
Options: Change it to match its surroundings · It can't change it · It's rainbow-colored · It's always red
Answer: Change it to match its surroundings
An octopus changes color to hide in its surroundings.
🐋 Q. What do whales use to talk to each other?
Options: Hand signals · Sound (songs) · Smell · Light
Answer: Sound (songs)
Whales talk across great distances with song-like sounds.
🌰 Q. What covers a sea urchin's body in sharp points?
Options: Hair · A shell · Scales · Spines
Answer: Spines
A sea urchin is covered all over in sharp spines.
🎐 Q. Does a jellyfish have a brain?
Options: Yes · No
Answer: No
A jellyfish has no brain.
🐙 Q. What do we call soft, boneless animals like octopus, squid, and clams?
Options: Mollusks · Mammals · Crustaceans · Fish
Answer: Mollusks
This soft, boneless group is called mollusks.
🦀 Q. What does a crab do with its shell as it grows?
Options: Keeps it · Only changes its color · Sheds it for a new one · It slowly stretches
Answer: Sheds it for a new one
A crab molts, shedding its old shell.
🐟 Q. What shape is a ray's body?
Options: Flat · Ball-shaped · Round · Long like a snake
Answer: Flat
A ray's body is wide and flat.
🦭 Q. Are fur seals and sea lions fish or mammals?
Options: Fish · Mammals · Shellfish · Amphibians
Answer: Mammals
Fur seals and sea lions are mammals that feed milk to their young.
🦈 Q. Which shark has the biggest body?
Options: Great white shark · Hammerhead shark · Whale shark · Dolphin
Answer: Whale shark
The whale shark is the biggest shark, but it's gentle.
🌿 Q. Are kelp and sea mustard animals, or plant-like seaweed?
Options: Seaweed · Animals
Answer: Seaweed
Kelp and sea mustard are seaweed growing in the ocean.
🌊 Q. What does seawater taste like?
Options: Like nothing · Salty · Sweet · Sour
Answer: Salty
Seawater has salt dissolved in it, so it's salty.
🐟 Q. What covers a fish's body?
Options: Fur · Scales · Feathers · A shell
Answer: Scales
A fish's body is covered in slippery scales.
🌑 Q. What is the deep, deep sea like?
Options: Nothing but sand · Nothing but ice · Bright and warm · Pitch dark and cold
Answer: Pitch dark and cold
Sunlight never reaches the deep sea, so it's dark and cold.
🎣 Q. What does the deep-sea anglerfish use to lure prey?
Options: Fast swimming · A loud noise · A sweet smell · A light on its head
Answer: A light on its head
An anglerfish waves the light on its head like bait to lure prey.
🐟 Q. Why do fish swim in big groups?
Options: To sleep · They're lost · They hate food · To protect themselves from enemies
Answer: To protect themselves from enemies
Grouping together keeps them safer from big predators.
🦀 Q. What does a crab use its claws for?
Options: Catching food and defending itself · Swimming · Making noise · Breathing
Answer: Catching food and defending itself
A crab catches food and defends itself with its claws.
🐚 Q. What do conches and sea snails carry on their backs?
Options: Fins · Spines · A shell · An ink sac
Answer: A shell
Conches and sea snails carry a spiral shell.
🦈 Q. What are a shark's bones made of?
Options: Wood · It has none · Cartilage (soft bone) · Hard stone
Answer: Cartilage (soft bone)
A shark's skeleton is made of soft cartilage.
🐋 Q. Does a whale lay eggs or give birth?
Options: It lays eggs · It gives birth
Answer: It gives birth
A whale is a mammal, so it gives birth and feeds its young milk.
⚡ Q. What can electric rays and electric eels produce?
Options: Sound · Fire · Light · Electricity
Answer: Electricity
They make electricity in their bodies to fight off enemies or catch prey.
🪸 Q. What do huge numbers of coral build that becomes a home for fish?
Options: An iceberg · A coral reef · A sandbar · A waterfall
Answer: A coral reef
A coral reef built by coral is a home for sea creatures.
🦐 Q. How does a shrimp dart away when startled?
Options: By squirting ink · By walking sideways · By flicking its tail to shoot backward · By flying with wings
Answer: By flicking its tail to shoot backward
A shrimp flicks its tail hard to shoot backward.
🦈 Q. What is a shark so good at that it finds food far away?
Options: Changing color · Making light · Smelling · Shouting
Answer: Smelling
A shark can smell blood in the water from far away.
🦐 Q. Which of these is NOT a shellfish (mollusk)?
Options: Mussel · Oyster · Shrimp · Littleneck clam
Answer: Shrimp
A shrimp is a crustacean; the rest are shellfish.
🦀 Q. Which of these would you NOT see on a tidal flat?
Options: Shark · Clam · Small octopus · Crab
Answer: Shark
Sharks live in the deep sea. You can find the rest on a tidal flat.
Q. What is the name of this sea creature?
Options: Pufferfish · Starfish · Dolphin · Squid
Answer: Dolphin
It's a dolphin! It sends out sound and listens to the echo to 'see' ahead — a very clever mammal.
Q. What is the name of this sea creature?
Options: Shrimp · Squid · Starfish · Whale
Answer: Squid
It's a squid! It has ten arms and squirts ink to escape danger.
Q. What is the name of this sea creature?
Options: Shrimp · Clam · Shark · Whale
Answer: Shrimp
It's a shrimp! It's a crustacean with a segmented body, and it sheds its shell to grow.
Q. What is the name of this sea creature?
Options: Sea otter · Clam · Lobster · Sea lion
Answer: Lobster
It's a lobster! It has huge claws, and some live more than 100 years.
Q. What is the name of this sea creature?
Options: Starfish · Shark · Seahorse · Sea turtle
Answer: Starfish
It's a starfish! It has an amazing power to regrow an arm that's been cut off.
Q. What is the name of this sea creature?
Options: Octopus · Jellyfish · Ray · Crab
Answer: Jellyfish
It's a jellyfish! It's 95% water, so it has no bones, no heart, and no brain.
Q. What is the name of this sea creature?
Options: Octopus · Squid · Sea turtle · Sea otter
Answer: Sea turtle
It's a sea turtle! It remembers the beach where it was born and swims thousands of km back to lay eggs.
Q. What is the name of this sea creature?
Options: Seahorse · Lobster · Octopus · Jellyfish
Answer: Seahorse
It's a seahorse! It's a fish, yet it swims upright, and the father carries the babies in his pouch.
Q. What is the name of this sea creature?
Options: Dolphin · Ray · Squid · Snail
Answer: Ray
It's a ray! It flaps its wide body like a bird's wings, seeming to fly through the sea.
Q. What is the name of this sea creature?
Options: Squid · Sea turtle · Ray · Sea lion
Answer: Sea lion
It's a sea lion! It can walk on land with its flippers, and unlike a seal, it has external ear flaps.
Q. What is the name of this sea creature?
Options: Sea otter · Clownfish · Pufferfish · Snail
Answer: Pufferfish
It's a pufferfish! When startled, it gulps water and puffs up like a ball to scare enemies.
Q. What is the name of this sea creature?
Options: Sea urchin · Clam · Pufferfish · Clownfish
Answer: Clownfish
It's a clownfish! Famous as 'Nemo', it lives safely inside a stinging sea anemone.
Q. What is the name of this sea creature?
Options: Sea urchin · Shrimp · Shark · Snail
Answer: Sea urchin
It's a sea urchin! Its spines protect it, and it creeps slowly on tiny tube feet between them.
Q. What is the name of this sea creature?
Options: Sea otter · Sea urchin · Ray · Sea lion
Answer: Sea otter
It's a sea otter! They hold hands while sleeping so they don't drift apart.
🐋 Q. Which whale is the biggest — the biggest animal on Earth?
Options: Dolphin · Sperm whale · Blue whale · Orca
Answer: Blue whale
The blue whale is far bigger than an elephant!
🐬 Q. How does a dolphin find its way where it can't see?
Options: It makes light · It sends out sound and listens for the echo · It smells · It reads a map
Answer: It sends out sound and listens for the echo
It checks its surroundings with 'ultrasound' — this is called echolocation.
🎐 Q. Why does a jellyfish sting hurt?
Options: Its tentacles have venomous stingers · It's hot · It has teeth · It has thorns
Answer: Its tentacles have venomous stingers
It catches prey with the venom in its tentacles.
⭐ Q. How many arms does a starfish usually have?
Options: 2 · 5 · 8 · 10
Answer: 5
Most have 5 arms, just like a star!
🐠 Q. What kind of relationship do a sea anemone and a clownfish (Nemo) have?
Options: They fight · They help each other and live together · They don't know each other · One eats the other
Answer: They help each other and live together
The clownfish gets a home and the anemone gets cleaned!
🦞 Q. What happens to a lobster's shell color when it's boiled?
Options: It turns blue · It turns red · It stays the same · It turns clear
Answer: It turns red
Heat leaves only the red pigment behind!
🐴 Q. Is a seahorse a fish or not?
Options: It's a fish · It's not a fish
Answer: It's a fish
It looks unusual, but it breathes with gills — it's a fish!
🐙 Q. How many hearts does an octopus have?
Options: 1 · 8 · 3 · 2
Answer: 3
An octopus has 3 hearts! And its blood is blue.
🦑 Q. How do squid and octopus shoot forward quickly?
Options: Only with fins · They wag a tail · They squirt water and get pushed the other way · They walk on their feet
Answer: They squirt water and get pushed the other way
They blast out water and zoom off like a rocket!
🐢 Q. How long does a sea turtle live?
Options: A month · Sometimes over 100 years · 1 year · 5 years
Answer: Sometimes over 100 years
It's a long-lived animal indeed!
🐡 Q. What's inside a pufferfish's body?
Options: Electricity · Honey · Ink · Strong poison
Answer: Strong poison
Pufferfish poison is so dangerous you must never eat one carelessly!
🦈 Q. What supports a shark's body instead of bone?
Options: Wood · Cartilage (soft bone) · Iron · Stone
Answer: Cartilage (soft bone)
Soft cartilage makes it light and fast!
🐳 Q. What is the spout of water a whale blows at the surface?
Options: Tears · Food it ate · Water it drank · Steam from breathing out
Answer: Steam from breathing out
It's the misty breath it blows out of its blowhole!
🦀 Q. What can a crab detach from itself in danger?
Options: Its shell · Its belly · Its eyes · A leg (or claw)
Answer: A leg (or claw)
The leg grows back again!
🌰 Q. Why do you have to watch out for sea urchins?
Options: They squirt poison · They bite · They have sharp spines · They carry electricity
Answer: They have sharp spines
Getting poked by a spine really hurts!
✨ Q. Which sea creatures sparkle with light underwater?
Options: Kelp · Clams · Carp · Glowing jellyfish and squid
Answer: Glowing jellyfish and squid
The deep sea is full of creatures that make their own light!
🦐 Q. Why is a shrimp's back curved?
Options: It's old · So it can flick its tail and dart backward fast · It's heavy · It's hurt
Answer: So it can flick its tail and dart backward fast
Its curved body lets it snap backward in a flash!
🐚 Q. How do scallops and clams move by opening and closing their shells?
Options: They clap their shells to squirt water and move · With ink · With fins · They walk on legs
Answer: They clap their shells to squirt water and move
Clams can swim too!
🦭 Q. Why do fur seals and seals come up onto land?
Options: There's no food · They hate water · They can't sleep · They're mammals that breathe with lungs
Answer: They're mammals that breathe with lungs
They come ashore to give birth and rest!
🐟 Q. Which is one of the fastest-swimming fish in the sea?
Options: Goldfish · Carp · Loach · Sailfish
Answer: Sailfish
A sailfish races along at over 100 km per hour!
🪨 Q. Where does a barnacle attach and live?
Options: Only on sand · On rocks and ship bottoms · In the sky · On trees
Answer: On rocks and ship bottoms
It sticks tight and lives in one spot its whole life!
🌸 Q. Is a sea anemone an animal or a plant?
Options: It's an animal · It's a plant
Answer: It's an animal
It looks like a flower, but it catches prey with tentacles — an animal!
🐟 Q. What does a fish's lateral line do?
Options: It senses water flow and vibrations · It makes color · It makes sound · It breathes
Answer: It senses water flow and vibrations
The lateral line feels movement all around it!
🐟 Q. Which flat-bodied fish lives on the sea floor?
Options: Sardine · Flounder and halibut · Mackerel · Anchovy
Answer: Flounder and halibut
They lie flat on the bottom and hide!
🦀 Q. Which animals are called 'cleaners of the sea' for eating dead prey?
Options: Crabs and starfish · Dolphins · Whales · Seahorses
Answer: Crabs and starfish
Grateful cleaners that keep the sea tidy!
🌿 Q. What do kelp, sea mustard, and laver use to make food?
Options: Rocks · Only air · Sunlight (photosynthesis) · Prey
Answer: Sunlight (photosynthesis)
They grow with sunlight, just like plants on land!
Q. What is the name of this sea creature?
Options: Hermit crab · Seal · Pufferfish · Jellyfish
Answer: Seal
It's a seal resting on the rocks — a mammal that feeds milk to its young!
Q. What is the name of this sea creature?
Options: Coral · Walrus · Crab · Whale
Answer: Walrus
The walrus, famous for its long tusks!
Q. What is the name of this sea creature?
Options: Tuna · Sea anemone · Jellyfish · Oyster
Answer: Tuna
It's a tuna, racing swiftly through the sea.
Q. What is the name of this sea creature?
Options: Salmon · Cuttlefish · Pufferfish · Shark
Answer: Salmon
The salmon, which swims back up rivers to lay its eggs!
Q. What is the name of this sea creature?
Options: Lobster · Hermit crab · Crab · Cuttlefish
Answer: Cuttlefish
It's a cuttlefish, with a hard bone inside its body.
Q. What is the name of this sea creature?
Options: Octopus · Sea anemone · Salmon · Jellyfish
Answer: Sea anemone
The sea anemone, which catches prey with its tentacles!
Q. What is the name of this sea creature?
Options: Coral · Pufferfish · Crab · Walrus
Answer: Coral
It's coral — countless tiny animals living together.
Q. What is the name of this sea creature?
Options: Hermit crab · Jellyfish · Seal · Cuttlefish
Answer: Hermit crab
The hermit crab, which makes an empty shell its home!
Q. What is the name of this sea creature?
Options: Squid · Mussel · Ray · Manta ray
Answer: Mussel
Mussels, which cling to rocks and live in big clusters!
Q. What is the name of this sea creature?
Options: Oyster · Lobster · Walrus · Crab
Answer: Oyster
It's an oyster, inside its bumpy shell.
Q. What is the name of this sea creature?
Options: Tuna · Oyster · Manta ray · Seal
Answer: Manta ray
The manta ray, swimming with what look like wide wings!