To dream of a wagtail flying in the wilderness indicates a sense of panic and uneasy appearance, indicating that the brothers are in trouble.

Dreaming of wagtail also means that you have a deep affection for your brothers and friends.

Original Dreamsmeaning Book

The dream wagtail flies in the wilderness. Flies and sings, walking and swaying, with the meaning of panic and uneasy, and the appearance of worry and uncomfortable. The master brother is in distress, and his friendship is urgent. Separation is for compatriots, for sharing worries, for siblings, and for friendship with friends. Menglin Xuanjie