Grey Wagtail Motacilla cinerea

Grey Wagtails - male and female
Grey Wagtail
Pair of Grey Wagtails, the male (top and right) with the stronger yellow chest and rump and the female with a paler lemon yellow; both with grey head and back.
Grey Wagtail maleThe male (above) has a dark chin in the breeding season (and white when non-breeding).
Grey Wagtail maleMale with fly
Grey Wagtail male
Grey Wagtail male
Grey Wagtails can be easily confused with Yellow and Citrine Wagtails (which have more yellow on their belly, no white flank, and sometimes yellow face/head/chin, and the former an olive-yellow back).
Grey Wagtail femaleThe female Grey Wagtail (above) has a white chin all year.
Grey Wagtail femaleFemale Grey Wagtail
Grey Wagtail femaleShe also has a paler yellow chest and rump than the male.
Grey Wagtail femaleWalking on water-lily leaves is typical of all wagtails in the hunt for aquatic insects.
Juvenile Grey Wagtail
Juvenile Grey Wagtail
Juvenile Grey Wagtail
The juvenile Grey Wagtail (above) has no, or very little, yellow on its chest and is easier to confuse with juvenile Yellow/Citrine/Blue-headed and even White/Pied Wagtails.