WhyReef - Fun Facts
The moon jellyfish is one of the most common kinds of jellyfish, yet is also one of the strangest animals on the reef. It is a floating sac with a mouth and arms. It can swim, but not to get from one place to another. It is happy to float along, but it needs to make sure that it can stay near the surface of the water, so that its thin tentacles have lots of room to hang and catch food. When its prey brush up against its tentacles, it fires thousands of stinging cells, or nematocysts, to poison them! Its tentacles bring the poisoned prey into its mouth to eat. Other jellyfish can kill humans with their stinging cells, but the moon jellyfish’s nematocysts don’t bother people much at all.
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