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Zebra mussel
A small mollusc that can multiply rapidly. They adhere to boats and can clog inlet pipes. They feed on edible fresh water mussels.

Zebra mussel
Word of the day
Irish settlers >> After a potato famine spread through Ireland in the 1840s, large numbers of Irish settlers arrived in Canada. Many of them helped build Canada’s transportation infrastructure, such as the Rideau Canal and Canadian Pacific Railway.