No. 1092 of 1,402
Lion's mane jellyfish
Cyanea capillata
Jellyfish & sea stingers🪼 Stinging tentacles
Danger to people: PainfulIt can really hurt, but it is almost never serious.Lion's mane jellyfish belongs to the group: Jellyfish & sea stingers. It lives in: The oceans.2
Venom power
Stinging tentacles
Thousands of tiny stinging cells fire when something touches them.
How dangerous is it to people?
Danger to people: PainfulIt can really hurt, but it is almost never serious.🚑 If it bites or stings
- Get out of the water and pick off any tentacles (with gloves or a cloth).
- For tropical box jellyfish: pour vinegar on the stings for at least 30 seconds, call for help and be ready to do CPR. For bluebottles and most others: rinse with seawater, then hot water for the pain.
Always call your emergency number first (112, 000, 911). This is general first aid guidance, not medical advice. First aid basics
⛑️ Stay safe
- Never touch, catch or tease a wild animal, even a small one, and even if it looks asleep or dead.
- Give it space. If you meet one, stay calm, step back slowly and let it go its own way.
- If one bites or stings you: stay calm, keep still, call your emergency number (112, 000, 911) or get to a hospital fast. Remember what it looked like, a photo helps.
It is not out to get you. It uses its venom to catch food or to protect itself, and it would much rather hide. More about staying safe
Where in the world?
How big is it?
How long is it?
🍌as long as 3 bananas end to end🧱as long as 16 toy building bricks in a row🏊could swim the length of a big swimming pool (50 m) in 140 seconds
How big is Lion's mane jellyfish compared to YOU?
Just maths in your browser. Nothing is saved or sent anywhere.
How fast is it?
A garden snail about 0.05 km/h (0.03 mph)
A tortoise about 0.3 km/h (0.19 mph)
Lion's mane jellyfish about 1.3 km/h (0.81 mph)
A person walking about 5 km/h (3.1 mph)
A kid on a bike about 12 km/h (7.5 mph)
Where the facts come from
- Cyanea capillata (iNaturalist): names and classification.
- Venom Wiki: the danger level, the typical size and the speed guess are our own. See how we work them out: How we rate danger.
Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are animal fans, not a science journal. Tell us at [email protected] and we will fix it.
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