DR. JOHN BRACKENBURY / SCIENCE PHOTO LIBRARY DR. JOHN BRACKENBURY / SCIENCE PHOTO LIBRARY
Brown-lipped snails (Cepaea nemoralis) mating. This snail, also known as the grove or banded snail, is found in many countries worldwide. The adult typically has a shell that is 2 to 3 centimetres in diameter. Colour and banding patterns seen on the shell varies depending on location. This snail is hermaphrodite and must mate to produce fertile eggs. Mating occurs mainly in late spring and early summer. During courtship a calcareous dart is jabbed into a potential partner, and mating results in the exchange of sperm. The sperm may be stored for some time, and individual broods can have mixed paternity. Photographed in the UK.
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