Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.
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Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.
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David Shale / Medusa caught with 1m ring net between 0 and 150m, Mid-Atlantic Ridge, North Atlantic Ocean
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Kim Taylor / Green Hydra (Hydra viridis) walking. Digital Composite showing five movement stages. UK
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Alex Hyde / Green hydra (Hydra viridissima) found in a garden pond. Derbyshire, UK. September. Winner of the Hidden Britain Category of the British Wildlife Photographer of the Year Awards (BWPA) Competition 2017...
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Albert Lleal / Green Hydra (Hydra viridissima) and Flatworm (Girardia tigrina), Spain
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Jan Hamrsky / Freshwater hydra (Hydra viridis) attached to submerged wood, Europe, February, controlled conditions.
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Albert Lleal / Green Hydra (Hydra viridissima) colony
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Jan Hamrsky / Free-living caddisfly larva (Rhyacophilidae) exploring small hydra, Europe, July, controlled conditions
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Jan Hamrsky / Brown hydra (Hydra oligactis) polyps attached to the stone, Europe, September, controlled conditions
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Jan Hamrsky / Brown hydra (Hydra oligactis) digesting the prey enclosed within the body cavity, Europe, September, controlled conditions
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Jan Hamrsky / Brown hydra (Hydra oligactis) with two buds on the body wall, extending its tentacles, Europe, September, controlled conditions
