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Osmia rufa is one of our commonest bees. The red Mason bee nests in of holes or crevices, frequently in numbers, in crumbling masonry. It is unlikely that the bee causes much, to buildings, as it only excavates crumbling mortar . The female uses mud to construct her cells, hence the name mortar bee. Females have two special horns on her face that she tamps mud with during nest building.
