The instructions state: “Record which birds you see in your bird-watching area, as well as the ones you didn’t see.” This field is required so that our researchers can interpret the data we receive to know if an answer is negative (that is, not seen, which is important because the absence of a bird can mean as much as its presence) or blank (that is, not entered because you are uncertain or forgot). This distinction will affect the results. Since we are collecting information on the birds that you did and did not see, we ask that participants select an oriole species (Baltimore or Bullock’s).