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the sand bees won't need any bee hotel :)
as long as there's a hole

both of these got really full house now
so they're filling the gaps, too
I was surprised to see clay on the narrow sides of the holes
and they're sleeping in the gap between those holes, too

I really have to go buy some more now hahaha

I have also seen a bit of tree trunk with many holes drilled into it as a bee hotel. Quick and easy to make yourself, but it won't last as long outside. Still, could be useful as emergency lodgings 8-).