Large nest blocks marked with white, blue, and yellow shapes.

Figure 50. Large-scale nesting operation for alfalfa leafcutting bees. The nest blocks have been marked with colored shapes as landmarks to help bees find their individual nests. Landmarks may or may not be needed in a small-scale bee hotel, but they do no harm.

Large nest blocks marked with white, blue, and yellow shapes.

Peggy Greb, courtesy of USDA ARS