title: Nesting Habits of Cavity Nesting Bees and Wasps in Portland, Oregon
abstract: Native bees are threatened by habitat loss through urbanization, however, there is increasing interest in creating bee nesting habitat in urban areas. Few studies have determined what species are present in the region, or examined the role of nest height or cavity size in attracting the approximate one-third of native bees that nest in cavities. To determine what species were present, and whether they showed preferences for nesting at a certain height or cavity width, we set up artificial wooden