I can’t take the credit for the title of today’s post: by sheer coincidence, after returning from a walk with photos of these tiny dirt mountains, I spotted a tweet about the mini volcanoes of the bee Andrena fulva, and it seemed a very appropriate description. Mine may not be the work of that same bee species but they do indicate where solitary bees have dug out nest burrows for their young. I’m not sure whether these bee volcanoes are from newly hatched bees emerging from their winter nests or these volcanoes have only recently been excavated for the adult bees to lay this year’s eggs.