Jellyfish snot can sting swimmers who never touch the animal

Mucus from jellyfish that sit upside-down on the seafloor has blobs lined with stinging cells

an Upside-down jellyfish

Upside-down jellyfish (pictured) can sting other animals without touching them thanks to microscopic clusters of stinging cells found in the snot that it releases into the surrounding water.

National Aquarium

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