PassNova has 6 free Kids Sea Life practice questions on Sea mammals, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Sea mammals: example questions & answers
6 worked examples with answers and explanations below. Practise them in the browser with instant feedback on every answer.
How does a dolphin breathe?
- AIt does not need to breathe
- BIt breathes through its fins
- CIt breathes underwater through gills
- DIt comes up to the surface to breathe air✓
Answer: Dolphins are mammals, so they must come up for air through a blowhole on top of their head.
Which of these is the biggest animal that has ever lived?
- AThe giant squid
- BThe great white shark
- CThe blue whale✓
- DThe elephant
Answer: The blue whale is a sea mammal and is even bigger than any dinosaur was.
Dolphins are well known for being very what?
- AClever and playful✓
- BSlow and sleepy
- CTiny and quiet
- DCold and scaly
Answer: Dolphins are clever animals that love to play and leap out of the water.
What do sea mammals like whales and dolphins feed their babies?
- ASand
- BMilk✓
- CSmall shells
- DSeaweed
Answer: Like all mammals, whale and dolphin mums feed their babies milk.
How do dolphins and whales talk to each other under the sea?
- ABy waving their fins like flags
- BBy blowing bubbles into words
- CBy making clicks and whistles✓
- DBy changing colour
Answer: Dolphins and whales make clicking and whistling sounds to send messages to each other.
Which sea mammal has long tusks and whiskers and rests on ice?
- AA tuna
- BA seahorse
- CA crab
- DA walrus✓
Answer: A walrus is a sea mammal with two long tusks and a bristly moustache of whiskers.