We have a Barred Owl that regularly throws himself against one of our windows in the spring. So your GHO might just have been reacting to a reflection.
Jan

Janet P Ray
Preston WA

> On Apr 17, 2017, at 8:50 PM, "hank.heiberg" <hank.heiberg at gmail.com> wrote:
>
> We just heard a tremendous thud against the sliding door that leads to our deck. I went over and turned on the deck light expecting to see a large bird dead or unconscious on the deck. Instead I saw a Great Horned Owl sitting on the deck railing. Before I was able to return with a camera or Karen could get over there the owl was gone. I checked the ground and it is not on the ground. Robins were making quite a ruckus in the laurels by the deck so maybe the owl is there.
>
> Hank Heiberg
> Lake Joy
> Carnation, WA
> hankdotheibergatgmaildotcom
>
> Sent from my iPad