Hydra reproduce both by budding and sexually. They can move slowly by turning somersaults and can conract into a gel-like ball or extend to many times their contracted size.
Brown HydraHydra vulgaris
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Projectina Microscope Camera: Canon Powershot S50
Showing ingested Daphnia The "knobbly bits" on the tentacles are stinging cells or cnidoblasts Zeiss GFL Microscope Camera: Canon Powershot S50 January 2005 |
Green HydraHydra viridissima |
Semi-contracted green hydra Microscope: Zeiss Standard GFL
Tentacle tip
Microscope: Zeiss Standard GFL |