A friend has a ‘bee hotel’ hanging from a tree branch in her flower-filled garden.
AMAZED is she !! to see little holes cut from leaves which perfectly fit the ‘hotel’ entrances. Maureen saw different sized holes nibbled from the leaves by the bees who enter the hole which fits their size… pull the accurately sized leaf- door over the entrance… and lay their eggs.
These are Solitary Bees. Essential pollinators. See ref. article below.