Examples from the Web for wagtail
The careless gesture reminded him of the matchless grace of the wagtail.The Promise of Air|Algernon Blackwood
Wagtail and Gelid had followed me on deck, and were now assisting their servants in putting the muskets in order.
Wagtail, too, was soon 98 obliged to beat a retreat, but Gelid remained firm as a rock.
The ceaseless wagging of a wagtail is a mere habit of cheerfulness, like the twirling of her thumbs by an idle Scotswoman.Concerning Animals and Other Matters|E.H. Aitken, (AKA Edward Hamilton)
A dull-coloured bird like a wagtail in shape, but with a shorter tail, which it sometimes wags in a half-hearted manner.Indian Birds|Douglas Dewar