The classification of birds is a contentious issue. Sibley and Ahlquist's Phylogeny and Classification of Birds (1990) is a landmark work on the subject. Most evidence seems to suggest the assignment of orders is accurate, but scientists disagree about the relationships among the orders themselves; evidence from modern bird anatomy, fossils and DNA have all been brought to bear on the problem, but no strong consensus has emerged. Fossil and molecular evidence from the 2010s is providing an increasingly clear picture of the evolution of modern bird orders.
The classification of birds is a contentious issue Sibley and Ahlquist's Phylogeny and Classification of Birds (1990) is a landmark work on the subject Most evidence seems to suggest the assignment of orders is accurate but scientists disagree about the relationships among the orders themselves; evidence from modern bird anatomy fossils and DNA have all been brought to bear on the problem but no strong consensus has emerged Fossil and molecular evidence from the 2010s is providing an increasingly clear picture of the evolution of modern bird orders