In case you read my last post and were wondering (just like us) what is inside that pretty green tube? Gorm opened it up to reveal bee larvae in their own little compartments covered in a film of pollen and something else we don't know. It is a fairly nondescript small, white, segmented worm-like creature lacking legs and eyes. The tube has been rolled up again and left alone. If the bees emerge I'll try to get a picture of what they look like.
There is a European leaf-cutter bee (Megachile rotundata) that seems to be better studied than the African ones. Has anyone seen it around?