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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
Green Hydra (Hydra viridis) walking. Digital Composite showing five movement stages. UK
Freshwater green hydra (Hydra viridissima) moving over a petri dish. Green colour comes from the symbiotic relationship with green alga Chlorella vulgaris