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Hydra belong to animals with radially symetric body. They can grow up to 10 mm in lenght. Their body is attached to the substrate by a basal disc („foot“) with the felp of sticky fluid. At the other end of their body is mouth opening serving also as a an anus. It is placed right among tentacles that are extremely elastic and hydra can have up to twelve of them.
If there is enough food hydras reproduce asexually by a process called strobilation. During it a miniature version of adult grows from a body wall and when reaching certain size it simply falls off and becoming independent. Entire prosess of strobilation can take place in just two days when food is plentiful.
In harsh conditions (e.g. winter arrival) hydras are able to reproduce sexually. Body wall swells and inside develops either testes or ovaria. In some species one individual can have both male and female reproductive organs (two swells). When adult dies, fertilised eggs wait in mud for better conditions to start new generation.
