Bug house

Hi, I have noticed that some of the holes in my bug house seem to have what looks like leaves blocking some of the holes, I regularly see bees in the holes but I'm not sure if it's the weather that has blown wet leaves onto the holes and they have stuck there or if it's a deliberate insect related cover, does anyone have any ideas?
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Sounds like you've got leaf-cutter bees there http://www.bumblebee.org/OTHERbees2.html#leafcutter
If you look around the garden you'll probably find leaves with semi-circles cut out of them - often on roses - great that you're encouraging the bees - we need them so much
http://www.turning-earth.co.uk/leaf_cutter_bee.htm
The Leaf Cutter Bees in our garden like Fuchsia Genii,Acer Orange Dream and Phlox Bright Eyes best
Pam x