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Updated: May 3, 2025
As everyone knows, the Mussel and the Oyster live between two hinged shells. In the last lesson we called them bi-valve molluscs, which is only another way of saying "soft-bodied animals with two shells." Have you ever opened an Oyster? It is a tug-of-war, your skill and strength against the muscles of the animal inside the tight shells.
Another surprising thing is their size. Some are enormous, so large that they make good washing-basins. Others are so small that you can hardly see them. Each one was made by the folds of the mantle of the animal that lived in it. In our coloured pictures you see many different kinds of shells, some of them built by uni-valve molluscs and some by bi-valve molluscs.
They swell in the water, until the yellowish bundle is three times as large as the Whelk that laid it. You often see the empty bundle blown by the wind along the shore. Give the names of two bi-valve molluscs. What is the Periwinkle's shell made of? Describe how the Periwinkle eats seaweed. How does the Whelk obtain its food? Give the names of three one-shelled molluscs.
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