Last week, I was talking with Kate LeCroy, a PhD Candidate at the University of Virginia in the Department of Environmental Sciences, about her recent paper on native Osmia declines in connection with the appearance of the non-native Osmia taurus. We got into a really interesting discussion about how to define and categorize native versus non-native bee species (not to be conflated with invasive species, which is a next-level consideration). What seemed like pretty clear boxes to draw around bees at the beginning of the discussion became decidedly less so by the end. Because, as is often the case with discovery, the more you learn about something, the more questions you ultimately have.