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A female Tawny Mining Bee on some heather in some recent sunshine
If you're patient you can watch them come and go from their holes. They're very industrious, not only excavating the holes but then laying eggs in them and stocking them with nectar and pollen for the newly emerged bees to feed on.
A female sat in the entrance to her nest hole
...and entering the nest hole
It is only the females that have the striking orange fur, the males are smaller and quite drab in comparison.
A male Tawny Mining Bee
but their pale facial hair does make the males quite photogenic!
Tawny Mining Bees are normally on the wing from early April until early June so they should be around for another few weeks.