How Fast Is Jellyfish?

Moon jellyfish pulse through water at about 0.5 km/h. They have no brain, no heart, and no bones — and are 95% water. Among the oldest animal lineages still alive on Earth today.

Jellyfish have no brain and no heart — yet they survive perfectly well, and have done for an extraordinary span of time.

• Same pace as a sloth on the ground
• 9× slower than a walking human