various explanations from

> Solitary bees are great pollinators: a single solitary bee could provide as much pollination as 120 honeybees.

> Solitary bees are friendly — they don’t produce honey and therefore have nothing to protect.

> The bees seal their holes after laying eggs. Once hatched, the offspring will break the seal to leave the Bee Home.

> you should clean it every third year in autumn after the offspring have hatched.

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