Twelve blue whale facts, fact-checked
The blue whale (Balaenoptera musculus) is the largest animal in the history of life on Earth. Full profile in our blue whale guide.
1. Larger than any dinosaur
At up to ~30 m and ~190 tonnes, no dinosaur in the fossil record approaches it.
2. The heart is the size of a small car
Around 180 kg, with a heartbeat detectable several metres away.
3. The tongue outweighs an elephant
Roughly 2.7 tonnes on its own.
4. They eat up to 4 tonnes of krill a day
Feeding is concentrated into a short intense season, then they live largely off reserves.
5. Lunge feeding is enormous
A blue whale engulfs a volume of water greater than its own body, then strains it through baleen plates.
6. Their calls cross ocean basins
Very low frequency calls above 180 decibels travel hundreds of kilometres.
7. Calves gain about 90 kg a day
On milk of roughly 35–50% fat, a calf grows faster than any other animal.
8. Whaling nearly ended them
Industrial whaling killed an estimated 99% of Antarctic blue whales before protection in 1966.
9. Recovery is slow but real
Some populations are increasing. Others remain at a tiny fraction of pre-whaling numbers.
10. Ship strikes are a leading cause of death
Feeding areas overlap busy shipping lanes; speed restrictions and rerouting measurably reduce mortality.
11. They are still Endangered
Despite protection, the global population remains far below historic levels.
12. Their faeces fertilise the ocean
Iron-rich waste stimulates plankton growth, which absorbs carbon — so whale recovery has a measurable climate dimension.
Read the full blue whale wildlife guide for IUCN status, population context and sources — or donate to WARN to help fund the partner teams protecting wildlife on the ground.
