This is a newly fledgled Yellow-rumped Warbler, just beginning to grow the "contour" feathers of its throat, breast and belly. Those are the brownish feathers and some yellow feathers you see forming along the sides of its breast and belly and under its throat. These feathers must come in before the young warbler is ready to make its first southward migration in just a matter of a few weeks.

Location: Glacier National Park, MT