mason bee
US /ˈmeɪ.sən biː/
UK /ˈmeɪ.sən biː/
1.
any of various solitary bees (family Megachilidae) that construct nests of mud or pebbles in crevices or holes
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We installed a mason bee house in our garden to help with pollination.
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Unlike honeybees, mason bees are solitary and do not produce honey.