Because birds must migrate to and from the district, this category implies that a species is transient during those times. As above, this category implies that a species is transient during its migration into and out of the district. This category also includes summer and winter visitor and post-nesting wanderer. Although the species has been observed within the district, it is out of its ordinary range and is not expected to return. The numbered columns before each species correspond to each trip or observation period.
Space is provided elsewhere for summarizing information about each trip.
This allows the checklist to be used more than once. Observations of birds not contained in this checklist or that are categorized as Accidental should be documented by photographs or complete details and every effort should be made to get other observers to substantiate the sighting. Birds of the Yuma District, A Checklist. United States Department of the Interior, Bureau of Land Management. Birds of the Yuma District, A Checklist.