Скачать или смотреть The fish that's also a pearl | Surprising Science

Pearls are the result of a mollusc's reaction to irritants such as parasites that enter its shell. Although model pearls are perfectly round and smooth, in reality they come in a huge number of shapes and sizes.

Watch Andreia Salvador, Curator of Marine Mollusca, take a look at one of the Museum's most extraordinary and precious pearls.
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