Hydra (animal) facts for kids

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Hydra viridis
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Order: Hydroida
Family: Hydridae
Genus: Hydra
Linnaeus, 1758

Hydras are simple invertebrates, with two layers of body cells. They live in the fresh water. Their body is radially symmetric. They have a central cavity that serves to both take in food and expel waste. Being Cnidarians they have stinging cells on their tentacles. They are hydrozoa, and belong to the same order as the polyps. Most hydras are microscopic in size. Hydras can be found in almost any unpolluted body of water. Hydras reproduce in an agamete way called budding. In budding, the offspring forms as a lump on the parent and eventually becomes big enough to break off and live by itself. They can move if they need to by a kind of slow somersaulting motion.

Recent research has found they produce an antimicrobial protein hydramacin, which protects their outer layer from bacterial infection.

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Hydra (animal) Facts for Kids. Kiddle Encyclopedia.