What specific example is given to illustrate how scientific understanding refines broad bird groupings?

Answer

The American Robin was moved into the thrush family (*Turdidae*)

The reclassification of the American Robin, which was once grouped near warblers but was later moved to the thrush family (*Turdidae*), demonstrates the dynamic nature of scientific bird classification.

What specific example is given to illustrate how scientific understanding refines broad bird groupings?
birdclasswarbler