I went to the Bronx Zoo last Wednesday with the Capital Region Photography Meetup Group. It was a very long day (we went to the Brooklyn Bridge to photograph it at night).
This image was made of a gorilla seemingly in thought. I used the Canon 300mm f4 L IS at f4 to create the shallow depth of field and produce a creamy bokeh (out of focus background).
More photos are in the photo galleries under Animals.