Many birders are understandably frustrated by changes in birds’ names, and in the sequence of species on checklists. It can be hard to keep up, but each revision generally highlights a significant advance in our understanding of birds and is worth some reflection.
It is important to point out that the changes are the judgments of expert ornithologists who base their decisions on published research. There is no “last word,” and modifications will continue. Any apparent inconsistencies or occasional reversals reflect the difficult and subjective nature of the decisions.
The changes that make the most news in birding circles involve either splitting or lumping species. Changes in the higher-level classifications, the genera and families to which species are assigned, usually get less attention, and any attention they do get is negative because they often involve confusing reshufflings of species, but these revisions are among the most interesting.
If you started birding in the 1970s, as I did, you learned that vireos and warblers were side by side in field guides. That was the sequence of families, and the proximity influenced how I thought about them. While kinglets, wrens, flycatchers, and other small thin-billed songbirds were clearly distinct from wood-warblers, the vireos occupied a special place close to warblers.