Water wagtail : See under Wagtail.

Example:


Taxonomy
wagtails, species, Motacilla, tail, signal, free encyclopedia, white-bellied, relationships, Voelker, African Pied Wagtail, Yellow Wagtail, Motacilla alba, Motacilla flava, genus, Systematics, birds, five species, Mekong Wagtail.

Defination from the web:
Wagtail belongs to the monotypic genus Dendronanthus which is closely related to Motacilla and sometimes included herein. ... The two remaining "monochrome" species, Mekong and African Pied Wagtail may be closely related, or a most striking example of convergent evolution. ...