How tragic. I'm so very sorry for your loss. I too, coincidentally, have a cockatoo named Jeffrey. He used to have a little pal, a Sun Conure named Teddy. They loved each other to pieces and slept snuggled together every night. As Jeffrey started to mature he plucked Teddy's head bald. I couldn't keep them apart and I was really concerned that Jeffrey would hurt him without meaning to. I finally found Teddy a new home, for his own safety. I know your Geoffrey didn't mean to hurt his friend any more than my Jeffrey did, but I think they just don't understand the size difference and how fragile the little ones can be. Again, I am so very sorry.