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Hammerhead sharks seen from below Alamy Stock Photo
Test your knowledge

How much do you know about sea creatures?

Test your knowledge of what lurks in the deep.
10.01pm, 31 May 2026
5.2k
41

THIS WEEK, BIOLOGISTS confirmed the discovery of a newly identified species of octopus.

The new species, Microeledone galapagensis, is a tiny blue octopus about the size of a golf ball. 

It was first spotted in 2015 during a deep-sea expedition at the Galápagos Islands off the coast of Ecuador. Years later, it has been officially identified as a new species. 

“These are little octopuses that live in the deep sea, and hardly anybody on Earth has ever got to see them,” said Janet Voight, the biologist who described the octopus.

So, today we would like to know: How much do you know about sea creatures? 

What is the fastest fish in the world?
Alamy
The mako shark
Alamy
The swordfish

Alamy
The Atlantic bluefin tuna
Shutterstock
The black marlin
What is the largest fish in the world?
Alamy
The basking shark
Alamy
The great white shark

Alamy
The whale shark
Alamy
The giant oceanic manta ray
True or false: Octopuses have no bones.
Alamy
True
False
What kind of fish is this?
Alamy
A lanternfish
An anglerfish

A lurefish
A Grim Reaper fish
What kind of whale is this?
Alamy
A unicorn whale
A horned whale

A narwhal
That's not a real whale. You made it up.
What is a group of dolphins called?
Alamy
A school
A pod

A family
A clan
How long have horseshoe crabs been around?
Alamy
More than 100 millions years
More than 200 million years

More than 300 million years
More than 400 million years
True or false: Male seahorses get pregnant.
Alamy
True
False
In Herman Melville's classic novel Moby Dick, what species is the whale Captain Ahab pursues?
Alamy
A sperm whale
A blue whale

A humpback whale
A right whale
True or false: Whales and dolphins have regional dialects.
Alamy
True
False
Which of these whale and dolphin species are NOT found in Irish waters?
Alamy
The blue whale
The orca

The bottlenose dolphin
The Atlantic humpback dolphin
The saltwater crocodile is the largest living reptile. They can grow to a length of...
Shutterstock
Four metres (13 ft)
Five metres (16ft)

Six metres (20 ft)
Seven metres (23 ft)
Answer all the questions to see your result!
You scored out of !
Turtley Awful
Shell of a bad effort.
Share your result:
You scored out of !
What are ewe doing?
Baaaaad.
Share your result:
You scored out of !
Fin-tastic
Flippin' good
Share your result:
You scored out of !
Clever cat
Almost purrfect
Share your result:
You scored out of !
Top dog
Pawsitively amazing!
Share your result:

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