Your very welcome.Thanks Triggaaar.
Masks are tricky around people's hair, animal fur and indeed feathers. In fact, they're tricky around everything, but those things are worse. You need to zoom right in when checking the edge of a mask.I use Camera Raw (Photoshop). I have noticed the border of objects when I edit when blowing the photos right up, but when reduced to normal size, I can't see it, therefore thinking I've done well. I tend to increase the clarity slightly, then go to the sharpening bit. I think I'll have to ease back a little on this. I do use a "mask", so in this case, it was just the geese that should have been affected in this part of the process.
But there are other options that can help, like brightening shadows instead of a global exposure increase, so it doesn't affect the bright areas so much. Whatever works. Maybe one of NSC's bird 'togs will give you some tips.