425 - The Trill of a Pine Warbler

My companion gasped in the middle of a sentence as a pine warbler darted over my head and landed on rough spruce bark a few feet way. Then he swooped to a rock wall and paused mid-hop to belt out a trill. We watched his stout beak open and his white wing bars vibrate with the effort. Pine warblers are aptly named, as they are rarely spotted anywhere but in pine trees.