Leaf cutter bee

We have a bee hotel that has 6 holes in use so far this year.
A leaf cutter bee might have used it last year as one of the holes was covered with bits of green leaf - but not this year so far.

It would be quite easy to make one - just need a block of wood, drill some holes in about 3/8" I would think and fix to wall not too high.

The leafcutters have only just arrived in our bee hotel so there's still time. It's quite funny to see them carrying the leaf, it looks like they're surfing. We've had 10 or so holes used by mason bees so far this year.