Backyard Summer Nature in New Jersey
Testosterone pumped-up male Brown-headed Cowbird. This guy keeps attacking its reflection in the window. It kept up with this all day yesterday and is back this morning. Some of the time his girlfriend sits and watches his antics. Image taken with a Nikon 1 V3 camera and 70-300 mm VR lens (ISO 450, 300 mm, f/5.6, 1/250 sec).