Bird Watching: Birds of the alpine tundra., 1 by Grasmussen

Grasmussen wrote:
Many warblers, including the Wilson's can be called by making a "Pisssss" sound. I played cat & mouse with this Wilson's Warbler for about a half an hour, and this was the best shot I took. I was at the edge of a willow thicket and called the warbler in by making the pisssss sound. It was constantly bouncing around in the bushes, most of the time less than ten feet away. I seldom saw more the a small patch of yellow through the leaves.