My first posting on request (from @brizhorticulture), who would have thought it would come to this: two of the solitary bees that can be found in The Netherlands, both mining bees:
Gray-backed mining-bee (Andrena vaga), grijze zandbij in Dutch:
Hairy legged mining bee (Dasypoda hirtipes), pluimvoetbij in Dutch:
I have some more photos of unusual bee species, but this will have to do for now.
Thanks for watching!