I find it truly astonishing that these bees can cut perfect circles out of leaves, fly with them, one by one, to a suitable tunnel - or sometimes under a rock or piece of wood - and form them into cells, then stock them with enough pollen to raise a new bee. This one is carrying a leaf circle to our insect hotel, where it has already filled several tunnels. The holes are 1/4 and 3/8 inches in diameter and both sizes are being used, although I believe by different species of leafcutters. (SG)