I also think that the image would have been much better composed if it had been shot in portrait orientation. . After turning the camera a quarter of the way around for portrait, there was something else that would also need to have been done - changing the focus point so that the active AF point would be placed right on the birds head/eye. . The way it is, the head looks very soft - almost as if you had focused on the body or the neck instead of the head/eye area.
I wonder if you are shooting from a tripod or not. . If you are shooting from a tripod, and a full gimbal head, then it is an easy, quick matter to rotate the camera and lens around via the rotating collar - it almost happens subconsciously once you're used to shooting from such an outfit. . That's one big advantage of using a tripod and a gimbal head - not just the stability that it offers, but the speed, smoothness, and surety with which you can rotate, pan with the subject, and recompose. . This all happens so much better when the weight is being handled by something other than your arms.
If you weren't using a tripod, then I can understand how rotating to portrait orientation would be awkward and slow - causing you to miss the shot.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "peace of mind", NOT "piece of mind".