|Diana Sudyka, |
The order of North American birds is based on taxonomy, the genetic relationships between species. The American Ornithological Union and their Classification Committee oversees this process and receives all current research and processes the list. What’s incredible about this process is the constant change. Separate species like the Slate-colored junco and the
junco are combined under a single Dark-eyed junco while the Northern oriole is separated
into the Baltimore oriole and the Bullocks oriole. Oregon
This graphic gives you an idea of some of the confusion between bird coloration and taxonomic location in a bird guide.