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Jellyfish belong to the Cnidaria phylum. Most species live in marine environments and exhibit radial symmetry. Their bodies are disc-shaped, with stinging tentacles that extend from the edges. Composed of up to 98% water, their gelatinous bodies can grow up to two meters in diameter. Jellyfish have primitive eyes located on their body surface, and within their structure is a single digestive cavity that serves as both mouth and anus. Jellyfish swim by contracting their disc-shaped bodies, a unique and highly efficient method of locomotion in water. As carnivores, they prey on small invertebrates, fish and occasionally other jellyfish, using their stinging tentacles to capture prey. The toxin in these tentacles can be potent enough to pose a serious risk to humans, with some species capable of delivering stings that are fatal to an unprepared swimmer.
