The Chelostoma rapunculi ^[1] females are extensively using the bee hotels for nesting.

Every year the numbers increase with a current peak in 2020 when numerous specimen were active.

The nests are closed with sand fortified using small pieces of stone. Nectar and possibly saliva glue the components together ^[2].

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Literature

¹ Nederlands Soortenregister

² Breugel, P. van., 2014. Gasten van bijenhotels. – EIS Kenniscentrum Insecten en andere ongewervelden & Naturalis Biodiversity Center, Leiden.