A male Ectemnius cavifrons ^[1,2] on the beehotel.
This year these bees were frequent visitors on the beehotel when the day started to near its end. They use the beehotel for sleeping. Finding a fitting sleeping spot turned out not to be an easy task as they spent a substantial amount of time inspecting all available cells accross all nesting blocks before finally crawling in one for the night.

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Literature

¹ Nederlands Soortenregister

² Dollfuss, H., 1991. Bestimmungsschlüssel der Grabwespen Nord-und Zentraleuropas. Stapfia, 24, 1-247.