Our little girl just recently passed away..... we found another little one. Put her in another room for a day and a half, Libbie seemed to not know. Put her impromptu cage right next to Libbie's. She paid no attention. We had them do a little neutral time on the ground to meet. Libbie barely paid attention to her, she ate her treat, the little one doesn't have a clue what treats are even though we give a piece every time we give to Lollie (4x per day a different piece of something) then, she finally smelled her and vice versa but still seemed fairly uninterested. I went off on a slight tangent there, but in the end they probably know but don't care. Which surprises me!