Bees and lawn aeration
I found quite a few of these in the garden a day or two ago:
It turned out they are a solitary bee – the Tawny Mining Bee, Andrena fulva – which explained the half-dozen or so mini-volcanoes in the lawn
It seems Andrena fulva are completely harmless; in fact they aerate the lawn and pollenate everything in sight, so they are very welcome here. There’s a good article about them at kendall-bioresearch.co.uk.