I photographed this Palm Warbler about a week ago on County Road 72, just south of Warba, MN. Its body feathers looked rather shabby and I thought it might just be wet from contact with the dew-covered grass. Then I looked up Palm Warbler in Birds of North America and found that this is the time of year for a partial feather molt for this species. I’ll bet some of the feathers are already missing and the new ones haven’t fully developed yet. Also, look at the feathers on this bird’s “shoulder.” They cover part of the wing feathers. It looks like two or three of them are in place but several others are still to appear.