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Commerson's dolphin © Miguel Iniguez/WDC

Facts, figures & video

Whales and dolphins are amazing. Find out incredible facts about their lives under the sea. Which is the biggest whale? The smallest dolphin? How far do whales migrate? Which whale makes the loudest sound? Do they sleep?

A life under the sea

Blue whale © Andrew Sutton

Facts about whales

Find out about the lives of the largest creatures living on the planet. Learn about whale migrations, the different types of whales and who has the biggest brain.

Harbour porpoise

Facts about dolphins and porpoises

Dolphins and porpoises come in all different sizes. From the magnificent orca to the tiny vaquita, dive into their world and learn more.

Male orca swimming off Kamchatka

Facts about orcas

Find out some amazing facts about orcas, the largest member of the dolphin family. There incredible creatures have evolved to inhabit every ocean, from the poles to the tropics.

Sperm whale


Which whale is the heaviest? Which one dives the deepest? The longest migration? Whales and dolphins hold some amazing records. Dive in and find out more and these incredible creatures.

Your favourite questions about whales and dolphins...

Why do whale and dolphin tails go up and down?

Risso's dolphins

Which whales and dolphins live in the UK?

Gray whale's undertake the longest migration of any whale

Which whale undertakes the longest migration?

The spern whale has the biggest brain. Photo by Vanessa Mignon.

Which whale has the biggest brain?

Blue whale at surface

Which is the largest whale species?

Record breakers

Longest baleen
belongs to a bowhead whale
Loudest sound
made by a sperm whale
Fastest baleen whale
achieved by a fin whale
Deepest dive
by a Cuvier's beaked whale
The longest tooth
belongs to a narwhal
Longest recorded journey
made by a gray whale

Help protect whales and dolphins and their homes

By adopting a whale or dolphin, by making a donation, or by fundraising for WDC, you can help us save these amazing creatures.

Orca - Rob Lott


Adopt a whale and follow the lives of these amazing creatures.

Bottlenose dolphins leaping


Your support helps us take action to protect their homes.

Humpback whale spyhop


Run, bake, walk, cycle… what could you do to help?