Additionally, the 4th and 5th editions of the ABA Checklist of the Birds of the Continental United States and Canada were used, as well as all of the mentioned field guides. The position indicated for each bird in lists 1 through 4 is with respect to the ABA Checklist, which is the same as the AOU Check-list except for absence of the AOU birds that are not accepted for the ABA checklist area. Quail become a separate family. Shrikes, Vireos, and Jays, Magpies, and Crows are placed before Larks, in that order. Starlings and Allies are placed after Mockingbirds and Thrashers.
Kinglets become a separate family.
Old World Warblers become a separate family. Thrushes become a separate family. Olive Warbler is placed in its own family preceding the Wood-warblers. Wood-warblers become a separate family. Tanagers become a separate family.