|Nikon D750, Nikkor 200-500mm f/5.6e @ 500mm, 1/2000, f/5.6, ISO 800|
This series will show the behavior I mentioned in this post that helped me identify which bird was male and female. It happened quick. The timestamp has the first photo pegged at 8:32:24 and the last at 8:32:25 on April 2, 2016. When I began saving the images as jpeg so they could be shown here I thought the maybe the first three didn't belong in this series but when I checked the time out of curiosity they undoubtedly belong. So the male comes in full-frontal and face-on to the female then does an abrupt 180 and lands on her back. It appeared that he slipped off and nothing more happened as I watched it occur. So I don't know if this was play or a botched attempt at mating or something else altogether but it was interesting to witness and I'm glad to have the images of it.
All of these images were shot with the same equipment and settings as mentioned under the first photo.