Ocean animals from sharks and whales to octopuses.
Test your knowledge with these top questions!
What do coral reefs provide for about 25% of all marine species?
One in four marine species finds a home among corals, yet the reefs themselves cover less than 1% of the ocean floor.
What do Southern Resident orcas in the Pacific Northwest mainly hunt?
Southern resident orcas favor fatty Chinook salmon, and Chinook declines leave these pods short of food.
How deep can narwhals dive when hunting prey?
Narwhals hunt Greenland halibut and cod during dives that can last about 25 minutes.
In which cold ocean region do narwhals live year-round?
Narwhals stay among Arctic pack ice, moving between offshore winter areas and coastal summer bays.
Which sound are California sea lions known for?
California sea lions bark to defend territory and keep contact in noisy colonies.
In which direction do most crabs walk?
A crab's legs bend sideways at the joints, so stepping sideways works like a row of oars.
How does a manatee tail differ from a dugong tail?
A manatee uses its broad rounded tail like an oar, while a dugong tail has a whale-like notch in the middle.
How does a starfish eat a clam too large for its mouth?
A starfish slides its stomach out through its mouth, digests the clam outside, then pulls it back in.
Coral polyps and sea anemones both belong to which stinging animal group?
The group is named for its stinging cells, which work like spring-loaded harpoons to snag food or deter attackers.
What hard material do reef-building coral polyps secrete to build reefs?
These skeletons accumulate into limestone, so a reef is the work of millions of tiny animals over centuries.