"two stout little wagtails"
Grey wagtail
Creative Commons AttributionGrey wagtail - Credit: Dan Davison
Pied wagtail
Creative Commons Attribution Share AlikePied wagtail - Credit: fs-phil

 Wagtails are songbirds belonging to the genus Motacilla. Not surprisingly, one of their main characteristics is that they just can't stop wagging their tails!

Species to be found in Britian include the grey wagtail (Motacilla cinerea); the pied wagtail (Motacilla alba yarrellii) and the yellow wagtail (Motacilla flava).