17 Aug 2014.
Buckingham Springs, Bucks Co, PA.
Found at the edge of a freshwater marsh.
This poor little female bird was very busy carrying caterpillars in from the field. I didn't realize until I got home and downloaded the picture that she was putting so much energy into feeding a baby that was MUCH larger than she is...a brown-headed cowbird?
The Common Yellowthroat (Geothlypis trichas) is a New World warbler. They are abundant breeders in North America, ranging from southern Canada to central Mexico.