@PufF Your comment asking how we knew they were bonded made me think quite a bit, so I tried an experiment today. I moved Russet's cage into another room (separated by two doors) and then brought him there, leaving Baby with my girlfriends GCC in the living room (separate cages). I expected immediate and constant contact calling until they were brought back together, but they really surprised me by simply being calm and quiet. They called a bit as I was taking Russet out of the room, but as soon as both doors were closed, they both sat calmly in their own cages. Baby acted very much like he did before we brought Russet to the home and Russet was uncharacteristically quiet. This continued for several hours, with both occasionally making happy singing at different objects and eating treats in their cage. Anyone who has experience with separating bonded/unbonded cockatiels, what type of behavior would you observe and how would you interpret what happened today?