How do dolphins sleep?

With half their brain at a time

Dolphins Knowledge Quiz – Test the Details

Every bottlenose dolphin has its own signature whistle, a kind of name, and this dolphins knowledge quiz is packed with surprises like that. Meet pink river dolphins in the Amazon, tool-using dolphins in Shark Bay and the orca, the biggest dolphin of all.

Start Dolphins Knowledge Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Names
What do bottlenose dolphins use like names?
Largest
What is the largest member of the dolphin family?
Echo
How do dolphins find food in murky water?
River
Which dolphin is pink and lives in South America's rivers?
Sleep
How do dolphins sleep?
Tools
In Shark Bay, Australia, some dolphins use what as a tool?
Smallest
Which is one of the world's smallest and rarest dolphins?
Group
What is a group of dolphins called?
Spin
Which dolphin is known for leaping and spinning in the air?
Extinct
Which river dolphin was declared functionally extinct in 2006?

Explanations: answer key for all 10 questions

Q1: What do bottlenose dolphins use like names?
Answer: Signature whistles
Each dolphin develops its own whistle.
Q2: What is the largest member of the dolphin family?
Answer: Orca
Orcas can be over 8 meters long.
Q3: How do dolphins find food in murky water?
Answer: Echolocation
They send clicks and listen for echoes.
Q4: Which dolphin is pink and lives in South America's rivers?
Answer: Amazon river dolphin
It is also called the boto.
Q5: How do dolphins sleep?
Answer: With half their brain at a time
This lets them keep breathing.
Q6: In Shark Bay, Australia, some dolphins use what as a tool?
Answer: Sea sponges
Sponges protect their snouts while foraging.
Q7: Which is one of the world's smallest and rarest dolphins?
Answer: Māui dolphin
It lives only off New Zealand.
Q8: What is a group of dolphins called?
Answer: A pod
Some pods join into superpods of thousands.
Q9: Which dolphin is known for leaping and spinning in the air?
Answer: Spinner dolphin
It can spin several times in one jump.
Q10: Which river dolphin was declared functionally extinct in 2006?
Answer: Baiji
It lived in China's Yangtze River.

Dolphins Knowledge Quiz – Smart Swimmers of the Sea

Dolphins are toothed whales known for their intelligence, playfulness and social lives. There are around 40 species, from small coastal dolphins to the powerful orca, and a few live in rivers in South America and Asia.

Dolphins find food with echolocation and communicate with clicks and whistles. Bottlenose dolphins recognize each other's signature whistles, and some groups invent hunting tricks, such as using sponges in Shark Bay or herding fish onto mud banks.

Fishing nets, pollution, boat traffic and dams threaten many dolphins. The baiji of the Yangtze has likely vanished, and the Māui dolphin and vaquita porpoise are close behind, so protecting their habitats is urgent.

What This Quiz Teaches

Anyone who loves marine life can learn something here.

How dolphins use names
How echolocation works
Where river dolphins live
How dolphins sleep
Which dolphins are endangered

Did You Know?

Dolphins can recognize themselves in mirrors.
Some dolphins live over 50 years.
Dolphins have no sense of smell.
Calves are born tail first.
Orcas hunt in family teams.