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Fightback starts against invasive species that threaten British plants and animals

Guardian: The pillwort fern is one of Britain's most unusual – and striking – native water plants. Its tiny fronds unfurl to create lush green underwater meadows in lakes and ponds. However, the pillwort is under threat, a victim of polluted waters and invasive species that are changing the watery habitats of Britain. The fern is not alone. The tadpole shrimp is another rare species that finds its existence similarly threatened. Considered to be a living fossil, the shrimp – known as Triops cancriformis...