Why do Wagtails wag their tails?

These Grey Wagtails, Motacilla cinerea, are so beautiful. In Italy they are not known as Grey Wagtails, they are known as Ballerina gialla. That’s a much more fitting name: Ballerina; dancer. I’ve tried and failed previously to get a reflection of a Grey Wagtail in a pool in very poor … Continue reading Why do Wagtails wag their tails?