It is still unknown how many of their species are on Earth. Different scientists call numbers from 100 to 200 thousand. About 3000 of them live in Russia.
In one season, an ordinary oyster produces more eggs than any other Shellfish – up to a million, or even more. But only a few of them survive.
The oldest animal on Earth is still considered to be a Shellfish caught near the shores of Iceland. His age, according to scientists, exceeded 400 years.
In some species of gastropods, snails, teeth, more than any other creature in the world – up to 25,000.
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