| − | * Some of the swans, notably the North American [[trumpeter swan]] and [[tundra swan]] were earlier classified to the genus ''[[Olor]]'', but they are now regarded as belonging to ''Cygnus''. | + | * Some of the swans, notably the North American [[trumpeter swan]] and [[tundra swan]] were earlier classified to the genus {{taxlink|Olor|genus}}, but they are now regarded as belonging to ''Cygnus''. |
