The box jellyfish Chironex fleckeri is infamous. Its venom will kill a human within minutes. This much I’ve known for decades. What I didn’t know until yesterday is that C. fleckeri has 24 eyes and appears to sleep.
More than a decade ago, researchers in Australia superglued acoustic transmitters to several box jellyfish (without getting stung) and set them free. Using an underwater microphone, they were then able to track their movements. The results were completely unexpected.
