Motacilla cinerea
The grey wagtail is more colourful than its name suggests with slate grey upper parts and distinctive lemon yellow under-tail. Its tail is noticeably longer than those of pied and yellow wagtails. They have gradually increased their range in the past 150 years and in the UK have expanded into the English lowlands from the northern and western uplands. They are badly effected by harsh winters, and because of recent moderate declines it is an Amber List species.