This is the first year that leaf-cutter bees have discovered the bee box placed invitingly on a south-facing wall – and only in the last month. Or maybe they had and didn’t like the box. Or the other occupants. Anyway, quite soon they had tenanted the remaining holes in the prestige penthouse log. 
Last week, the LCBs were quite active, so from time to time I watched them. The first one was completing its work in the top-right log on the lower storey. Having packed in the leaves, it spent quite some time perfecting the job, leaving a smooth end to the bright green plug.
Later on I saw a bee engaged in an earlier stage of construction. It chose the same log, and initially went for the middle hole, disappearing with a strip of leaf. It then revised its accommodation plans, reversed out with the leaf and took it to the adjacent hole.
I found the bees surprisingly difficult to photograph. I had to change cameras to a ‘faster’ one, because a bee would zoom back to the hole with its leaf and dive straight in, dragging the leaf behind it; and emerge suddenly and fly off at speed. Sometimes there was a struggle to get the leaf into the hole, which helped take a shot; or I could see the bee pause in the dark but quite close to the entrance before flying off. But mostly, the comings and goings took me by surprise every time, even though I was ready for them…
I checked the plants in the vicinity for the tell-tale semi-circles cut out of the leaves. They seem to have liked a nearby rose and another plant whose name I forget (if I ever knew). They use saliva to glue the cuttings together to build the cells for their larvae. The larvae have a safe place to hatch and develop. They pupate in the autumn and hibernate during the winter. Now that the leaf-cutters have found the box, we are hoping that next year the new generation will go through the whole process again. And that I will be more handy with the camera.
NOTE: I see that these bees are often called Leafcutter bees, or Leaf Cutter bees, whereas I have plumped for a hyphen. I’m going (having retrospectively checked) with the Natural History Museum’s version…
ROLLING HARBOUR GALLERY 