Indigo Bunting (Bldg. 11B). This male was likely born this summer and was learning his way south for the winter. 

Indigo Buntings migrate at night, using the stars for guidance. The birds possess an internal clock that enables them to continually adjust their angle of orientation to a star—even as that star moves through the night sky.

The oldest known wild Indigo Bunting was 8 years, 3 months old.
(http://www.allaboutbirds.org/guide/Indigo_Bunting/lifehistory)