leaf-cutter bee
US /ˈliːfˌkʌt̬.ɚ biː/
UK /ˈliːfˌkʌt̬.ɚ biː/

1.
a solitary bee that cuts neat, circular pieces from leaves or petals to line its nest cells
:
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The gardener noticed the precise, circular cuts on his rose leaves, a sure sign of a leaf-cutter bee at work.
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Unlike honeybees, leaf-cutter bees are solitary and do not live in large colonies.