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Tapeworm (Taenia pisiformis) of European brown hare (Lepus europaeus) showing 'circular-saw-like' structure on the head, or scolex, which will anchor into the hare's small intestine. Microscopic view taken from an old museum microscope slide preparation made in about 1890 by Watson & Sons, London..Prix de la Photographie de Paris (Px3) Competition 2022 – Nature / Wildlife category - Honourable Mention.. (KEYSTONE/NATURE PICTURE LIBRARY/David Maitland)